God is immaterial spirit

But grant that they acknowledge the same. What then? Because the multitude, who cannot distinguish between matter and God, or see how great is the interval which lies between them, pray to idols made of matter, are we therefore, who do distinguish and separate the uncreated and the created, that which is and that which is not, that which is apprehended by the understanding and that which is perceived by the senses, and who give the fitting name to each of them,—are we to come and worship images?

Athenagoras of Athens
A Plea for the Christians
Chapter XV

Christ’s body as the Ark of the Covenant

For as the ark [of the covenant] was gilded within and without with pure gold, so was also the body of Christ pure and resplendent; for it was adorned within by the Word, and shielded without by the Spirit, in order that from both [materials] the splendor of the natures might be clearly shown forth.

…so is that ark declared a type of the body of Christ, which is both pure and immaculate.

Irenaeus of Lyons
Lost Writings
Fragment VIII and XLVIII

Through the “person” of the Spirit we see

These things, therefore, He recapitulated in Himself: by uniting man to the Spirit, and causing the Spirit to dwell in man, He is Himself made the head of the Spirit, and gives the Spirit to be the head of man: for through Him (the Spirit) we see, and hear, and speak.

Irenaeus of Lyons
Against Heresies, Book V
Chapter XX

To be spiritual is to be embodied, not disembodied

In like manner we do also hear many brethren in the Church, who possess prophetic gifts, and who through the Spirit speak all kinds of languages, and bring to light for the general benefit the hidden things of men, and declare the mysteries of God, whom also the apostle terms “spiritual,” they being spiritual because they partake of the Spirit, and not because their flesh has been stripped off and taken away, and because they have become purely spiritual. For if any one take away the substance of flesh, that is, of the handiwork [of God], and understand that which is purely spiritual, such then would not be a spiritual man but would be the spirit of a man, or the Spirit of God.

…For that flesh which has been moulded is not a perfect man in itself, but the body of a man, and part of a man. Neither is the soul itself, considered apart by itself, the man; but it is the soul of a man, and part of a man.

Irenaeus of Lyons
Against Heresies, Book V
Chapter VI

 

His soul for our souls, His flesh for our flesh

Since the Lord thus has redeemed us through His own blood, giving His soul for our souls, and His flesh for our flesh, and has also poured out the Spirit of the Father for the union and communion of God and man, imparting indeed God to men by means of the Spirit, and, on the other hand, attaching man to God by His own incarnation, and bestowing upon us at His coming immortality durably and truly, by means of communion with God,—all the doctrines of the heretics fall to ruin.

Irenaeus of Lyons
Against Heresies, Book V
Chapter I

The Holy Spirit through the Church is the ladder of ascent to God

But [it has, on the other hand, been shown], that the preaching of the Church is everywhere consistent, and continues in an even course, and receives testimony from the prophets, the apostles, and all the disciples—as I have proved— through [those in] the beginning, the middle, and the end, and through the entire dispensation of God, and that well-grounded system which tends to man’s salvation, namely, our faith; which, having been received from the Church, we do preserve, and which always, by the Spirit of God, renewing its youth, as if it were some precious deposit in an excellent vessel, causes the vessel itself containing it to renew its youth also. For this gift of God has been entrusted to the Church, as breath was to the first created man, for this purpose, that all the members receiving it may be vivified; and the [means of] communion with Christ has been distributed throughout it, that is, the Holy Spirit, the earnest of incorruption, the means of confirming our faith, and the ladder of ascent to God.

…For where the Church is, there is the Spirit of God; and where the Spirit of God is, there is the Church, and every kind of grace; but the Spirit is truth.

Irenaeus of Lyons
Against Heresies, Book III
Chapter XXIV

The Holy Spirit is “water from heaven” and makes all one in Christ

Wherefore also the Lord promised to send the Comforter,3620 who should join us to God. For as a compacted lump of dough cannot be formed of dry wheat without fluid matter, nor can a loaf possess unity, so, in like manner, neither could we, being many, be made one in Christ Jesus without the water from heaven.

Irenaeus of Lyons
Against Heresies, Book III
Chapter XVII

The Holy Spirit Can Speak

Let us therefore, brethren, be of humble mind, laying aside all haughtiness, and pride, and foolishness, and angry feelings; and let us act according to that which is written (for the Holy Spirit saith, “Let not the wise man glory in his wisdom, neither let the mighty man glory in his might, neither let the rich man glory in his riches; but let him that glorieth glory in the Lord, in diligently seeking Him, and doing judgment and righteousness”), being especially mindful of the words of the Lord Jesus which He spake, teaching us meekness and long-suffering.

Clement of Rome
Epistle to the Corinthians
Chapter XIII