Matthew 18:19

Epistle of Ignatius to the Ephesians

For if I in this brief space of time, have enjoyed such fellowship with your bishop-I mean not of a mere human, but of a spiritual nature-how much more do I reckon you happy who are so joined to him as the Church is to Jesus Christ, and as Jesus Christ is to the Father, that so all things may agree in unity! Let no man deceive himself: if any one be not within the altar, he is deprived of the bread of God. For if the prayer of one or two possesses[34]

Epistle of Ignatius to the Ephesians

on him as the Church does on the Lord Jesus, and the Lord does on God and His Father, that so all things may agree in unity! Let no man deceive himself: if any one be not within the altar, he is deprived of the bread of God. For if the prayer of one or two possesses[38]

Origen Against Celsus Book VIII

We say that "if two" of us "shall agree on earth as touching anything that they shall ask, it shall be done for them of the Father" of the just, "which is in heaven; "[127]

Cyprian Epistle VII

if only our prayers, our groanings, and our tears, knock at the door; and with these we must be urgent and persevering, even although prayer be offered with one mind.[8]

Cyprian Epistle VII

And again, "I say unto you, that if two of you shall agree on earth as touching anything that you shall ask, it shall be done for you of my Father which is in heaven."[12]

Cyprian Treatise I On the Unity of the Church

For the Lord, when He would urge unanimity and peace upon His disciples, said, "I say unto you, That if two of you shall agree on earth touching anything that ye shall ask, it shall be given you by my Father which is in heaven. For wheresoever two or three are gathered together in my name, I am with them; "[38]

Cyprian Treatise XII Three Books of Testimonies Against the Jews

Also in the same place: "Verily I say unto you, That if two of you shall agree on earth concerning everything, whatever you shall ask it shall be given you from my Father which is in heaven. For wherever two or three are gathered together in my name, I am with them."[377]

Origen Commentary on Matthew Book XIV "[2]