Tradition confirms what is not in scripture

And how long shall we draw the saw to and fro through this line, when we have an ancient practice, which by anticipation has made for us the state, i.e., of the question? If no passage of Scripture has prescribed it, assuredly custom, which without doubt flowed from tradition, has confirmed it. For how can anything come into use, if it has not first been handed down?

Tertullian
The Chaplet
Chapter III

Baptism included a rite of exorcism

Lest any one think that we are dealing in mere argumentative subtleties, I shall turn to that highest authority of our “seal” itself. When entering the water, we make profession of the Christian faith in the words of its rule; we bear public testimony that we have renounced the devil, his pomp, and his angels.

Tertullian
The Shows
Chapter IV

The Last Judgment and Resurrection of the Dead

When, therefore, the boundary and limit, that millennial interspace, has been passed, when even the outward fashion of the world itself—which has been spread like a veil over the eternal economy, equally a thing of time—passes away, then the whole human race shall be raised again, to have its dues meted out according as it has merited in the period of good or evil, and thereafter to have these paid out through the immeasurable ages of eternity. Therefore after this there is neither death nor repeated resurrections, but we shall be the same that we are now, and still unchanged—the servants of God, ever with God, clothed upon with the proper substance of eternity; but the profane, and all who are not true worshippers of God, in like manner shall be consigned to the punishment of everlasting fire—that fire which, from its very nature indeed, directly ministers to their incorruptibility.

Tertullian
Apology
Chapter XLVIII

Resurrection of the flesh and judgment and denial of preexistence

If there is any ground for the moving to and fro of human souls into different bodies, why may they not return into the very substance they have left, seeing this is to be restored, to be that which had been?  They are no longer the very things they had been; for they could not be what they were not, without first ceasing to be what they had been. If we were inclined to give all rein upon this point, discussing into what various beasts one and another might probably be changed, we would need at our leisure to take up many points. But this we would do chiefly in our own defense, as setting forth what is greatly worthier of belief, that a man will come back from a man—any given person from any given person, still retaining his humanity; so that the soul, with its qualities unchanged, may be restored to the same condition, thought not to the same outward framework. Assuredly, as the reason why restoration takes place at all is the appointed judgment, every man must needs come forth the very same who had once existed, that he may receive at God’s hands a judgment, whether of good desert or the opposite. And therefore the body too will appear; for the soul is not capable of suffering without the solid substance (that is, the flesh; and for this reason, also) that it is not right that souls should have all the wrath of God to bear: they did not sin without the body, within which all was done by them. But how, you say, can a substance which has been dissolved be made to reappear again?  Consider thyself, O man, and thou wilt believe in it! Reflect on what you were before you came into existence. Nothing. For if you had been anything, you would have remembered it. You, then, who were nothing before you existed, reduced to nothing also when you cease to be, why may you not come into being again out of nothing, at the will of the same Creator whose will created you out of nothing at the first?

Tertullian
Apology
Chapter XLVIII

Traditions of Gehenna and Paradise

Accordingly, we get ourselves laughed at for proclaiming that God will one day judge the world. For, like us, the poets and philosophers set up a judgment-seat in the realms below.  And if we threaten Gehenna, which is a reservoir of secret fire under the earth for purposes of punishment, we have in the same way derision heaped on us. For so, too, they have their Pyriphlegethon, a river of flame in the regions of the dead. And if we speak of Paradise, the place of heavenly bliss appointed to receive the spirits of the saints, severed from the knowledge of this world by that fiery zone as by a sort of enclosure, the Elysian plains have taken possession of their faith.

Tertullian
Apology
Chapter XLVII

Heresies all come after the Apostolic tradition

Nor need we wonder if the speculations of philosophers have perverted the older Scriptures. Some of their brood, with their opinions, have even adulterated our new-given Christian revelation, and corrupted it into a system of philosophic doctrines, and from the one path have struck off many and inexplicable by-roads.145 And I have alluded to this, lest any one becoming acquainted with the variety of parties among us, this might seem to him to put us on a level with the philosophers, and he might condemn the truth from the different ways in which it is defended. But we at once put in a plea in bar against these tainters of our purity, asserting that this is the rule of truth which comes down from Christ by transmission through His companions, to whom we shall prove that those devisers of different doctrines are all posterior. Everything opposed to the truth has been got up from the truth itself, the spirits of error carrying on this system of opposition.

Tertullian
Apology
Chapter XLVII

Tertullian describes the Agape feast

Yet about the modest supper-room of the Christians alone a great ado is made.  Our feast explains itself by its name.  The Greeks call it agapè, i.e., affection. Whatever it costs, our outlay in the name of piety is gain, since with the good things of the feast we benefit the needy; not as it is with you, do parasites aspire to the glory of satisfying their licentious propensities, selling themselves for a belly-feast to all disgraceful treatment,—but as it is with God himself, a peculiar respect is shown to the lowly. If the object of our feast be good, in the light of that consider its further regulations. As it is an act of religious service, it permits no vileness or immodesty. The participants, before reclining, taste first of prayer to God. As much is eaten as satisfies the cravings of hunger; as much is drunk as befits the chaste.  They say it is enough, as those who remember that even during the night they have to worship God; they talk as those who know that the Lord is one of their auditors. After manual ablution, and the bringing in of lights, each is asked to stand forth and sing, as he can, a hymn to God, either one from the holy Scriptures or one of his own composing,—a proof of the measure of our drinking. As the feast commenced with prayer, so with prayer it is closed. We go from it, not like troops of mischief-doers, nor bands of vagabonds, nor to break out into licentious acts, but to have as much care of our modesty and chastity as if we had been at a school of virtue rather than a banquet.

Tertullian
Apology
Chapter XXXIX

Christians took an offering that was not obligatory

The tried men of our elders preside over us, obtaining that honor not by purchase, but by established character. There is no buying and selling of any sort in the things of God. Though we have our treasure-chest, it is not made up of purchase-money, as of a religion that has its price. On the monthly day, if he likes, each puts in a small donation; but only if it be his pleasure, and only if he be able: for there is no compulsion; all is voluntary. These gifts are, as it were, piety’s deposit fund.  For they are not taken thence and spent on feasts, and drinking-bouts, and eating-houses, but to support and bury poor people, to supply the wants of boys and girls destitute of means and parents, and of old persons confined now to the house; such, too, as have suffered shipwreck; and if there happen to be any in the mines, or banished to the islands, or shut up in the prisons, for nothing but their fidelity to the cause of God’s Church, they become the nurslings of their confession. But it is mainly the deeds of a love so noble that lead many to put a brand upon us.

Tertullian
Apology
Chapter XXXIX

Christ will raise and judge the same body that died

Mock as you like, but get the demons if you can to join you in your mocking; let them deny that Christ is coming to judge every human soul which has existed from the world’s beginning, clothing it again with the body it laid aside at death;

Tertullian
Apology
Chapter XXIII