John 14:9

Tertullian An Answer to the Jews

For God the Father none ever saw, and lived.[170]

Tertullian Against Praxeas

and, "He that hath seen me hath seen the Father; and I am in the Father, and the Father in me."[242]

Tertullian Against Praxeas

whom He had reproached them for being ignorant of after so long a time-in a word, as the Son. And now it may be seen in what sense it was said, "He that hath seen me hath seen the Father,"[329]

Origen de Principiis Book I

For He by whom the Son Himself is understood, understands, as a consequence, the Father also, according to His own words: "He that hath seen Me, hath seen the Father also."[41]

Origen de Principiis Book II

Whereas, on the contrary, God, the Father of Christ, is said to be seen, because "he who sees the Son," he says, "sees also the Father."[50]

Origen Against Celsus Book VII

and not only so, but also in the sense of the words of Him "who is the image of the invisible God; "He who hath seen Me hath seen the Father who sent Me."[100]

A Treatise of Novatian Concerning the Trinity

For again and again, and frequently, he objects that it was said, "Have I been so long time with you, and do ye not know me, Philip? He who hath seen me, hath seen the Father also."[220]

Pseudo-Gregory Thaumaturgus Fourth Homily

hear Him. If He shall say, He that hath seen me hath seen the Father,[24]

Alexander Epistles on the Arian Heresy

Or how is He unlike to the substance of the Father, who is the perfect image and brightness of the Father, and who says, "He that hath seen Me hath seen the Father? "[53]