The Sunday Eucharist replaces the Sabbath

If, therefore, those who were brought up in the ancient order of things have come to the possession of a new hope, no longer observing the Sabbath, but living in the observance of the Lord’s Day, on which also our life has sprung up again by Him and by His death—whom some deny, by which mystery we have obtained faith, and therefore endure, that we may be found the disciples of Jesus Christ, our only Master—how shall we be able to live apart from Him, whose disciples the prophets themselves in the Spirit did wait for Him as their Teacher? And therefore He whom they rightly waited for, being come, raised them from the dead.

Ignatius of Antioch
Epistle to the Magnesians
Chapter IX

Jesus — God manifested

Be not deceived with strange doctrines, nor with old fables, which are unprofitable. For if we still live according to the Jewish law, we acknowledge that we have not received grace. For the divinest prophets lived according to Christ Jesus. On this account also they were persecuted, being inspired by His grace to fully convince the unbelieving that there is one God, who has manifested Himself by Jesus Christ His Son, who is His eternal Word, not proceeding forth from silence, and who in all things pleased Him that sent Him.

Ignatius of Antioch
Epistle to the Magnesians
Chapter VIII

Do all things in harmony with the Holy Orders

Since therefore I have, in the persons before mentioned, beheld the whole multitude of you in faith and love, I exhort you to study to do all things with a divine harmony, while your bishop presides in the place of God, and your presbyters in the place of the assembly of the apostles, along with your deacons, who are most dear to me, and are entrusted with the ministry of Jesus Christ, who was with the Father before the beginning of time, and in the end was revealed.

Ignatius of Antioch
Epistle to the Magnesians
Chapter VI

The Father is the bishop of us all

Now it becomes you also not to treat your bishop too familiarly on account of his youth, but to yield him all reverence, having respect to the power of God the Father, as I have known even holy presbyters do, not judging rashly, from the manifest youthful appearance of their bishop, but as being themselves prudent in God, submitting to him, or rather not to him, but to the Father of Jesus Christ, the bishop of us all.

Ignatius of Antioch
Epistle to the Magnesians
Chapter III

Jesus — the constant source of our life

For as one who has been thought worthy of the most honorable of all names, in those bonds which I bear about, I commend the Churches, in which I pray for a union both of the flesh and spirit of Jesus Christ, the constant source of our life, and of faith and love, to which nothing is to be preferred, but especially of Jesus and the Father, in whom, if we endure all the assaults of the prince of this world, and escape them, we shall enjoy God.

Ignatius of Antioch
Epistle to the Magnesians
Chapter I

Eucharist—the medicine of immortality

Especially will I do this if the Lord make known to me that you come together man by man in common through grace, individually, in one faith, and in Jesus Christ, who was of the seed of David according ot the flesh, being both the Son of man and the Son of God, so that you obey the bishop and the presbytery with an undivided mind, breaking on and the same bread, which is the medicine of immortality, and the antidote to prevent us from dying, but which causes that we should live forever in Jesus Christ.

Ignatius of Antioch
Epistle to the Ephesians
Chapter XX

God manifested in human form

Hence every kind of magic was destroyed, and every bond of wickedness disappeared; ignorance was removed, and the old kingdom abolished, God Himself being manifested in human form for the renewal of eternal life. And now that took a beginning which had been prepared by God. Henceforth all things were in a state of tumult, because He mediated the abolition of death.

Ignatius of Antioch
Epistle to the Ephesians
Chapter XIX

Begotten before time

For the Son of God, who was begotten before time began, and established all things according to the will of the Father, He was conceived in the womb of Mary, according to the appointment of God, of the seed of David and by the Holy Spirit.

Ignatius of Antioch
Epistle to the Ephesians
Chapter XVIII