Cyprian
Cyprian - Treatise XI Exhortation to Martyrdom Addressed to Fortunatus
https://www.catholiccrossreference.online/fathers/index.php/1 john 2:23
John too: “Whosoever denieth the Son, the same hath not the Father; he that acknowledgeth the Son, hath both the Son and the Father.”
Cyprian - Treatise XII Three Books Of Testimonies Against The Jews
Also in the Epistle of John:
“Whosoever denieth the Son, the same also hath not the Father. He that confesseth the Son, hath both the Son and the Father.”
https://books.google.com/books?id=wrwPAAAAIAAJ&pg=PA285
This might be a different verse.
Cyprian - Treatise 13 - Exortations unto Martyrdom, Addressed to Fortunatus
https://books.google.com/books?id=wrwPAAAAIAAJ&pg=PA285
For this cause in the Gospel lie utters threat, and says, Whosoever shall confess Me before men, him will I confess also before My Father which is in heaven ; but whosoever shall deny Me before men, him will I also deny before My Father which is in heaven.
1 John 2:23 (AV)
Whosoever denieth the Son,
the same hath not the Father:
[
but]
he that acknowledgeth the Son hath the Father also.
Matthew 10:32-33 (AV)
Whosoever therefore shall confess me before men, him will I confess also before my Father which is in heaven.
But whosoever shall deny me before men, him will I also deny before my Father which is in heaven.
Matthew 10:40 (AV)
He that receiveth you receiveth me,
and he that receiveth me receiveth him that sent me.
John 14:9 (AV)
Jesus saith unto him,
Have I been so long time with you,
and yet hast thou not known me, Philip?
he that hath seen me hath seen the Father;
and how sayest thou
then,
Shew us the Father?
Origen
As he who in these times does not know the Son has not the Father either,
https://books.google.com/books?id=uSsRAAAAYAAJ&pg=PA343
https://www.ellopos.net/elpenor/greek-texts/fathers/origen/john-commentary.asp?pg=107
Clement of Alexandria
The Stromata, or Miscellanies
Fragments of Clemens Alexandrinus
1 John 2:23
https://www.catholiccrossreference.online/fathers/index.php/1 john 2:23
“He who denies the Son,” by ignoring Him, “has not the Father, nor does he know Him.” But he who knoweth the Son and the Father, knows according to knowledge, and when the Lord shall be manifested at His second advent, shall have confidence and not be confounded. Which confusion is heavy punishment.
Augustine: Homilies on the Gospel of John, Homilies on the First Epistle of John, Soliloquies
Ten Homilies on the First Epistle of John.
10. These things are now manifest, my brethren. Let no man say, I do not worship Christ, but I worship God His Father. “Every one that denieth the Son, hath neither the Son nor the Father; and he that confesseth the Son, hath both the Son and the Father.”
https://books.google.com/books?id=CAcNAAAAIAAJ&pg=PA480
And footnote
Athanasius
‘For he who hath the Son,’ saith He, ‘hath the Father also;’ and ‘he that receiveth Me, receiveth Him that sent Me 1 John ii. 23; Matt. x. 40..’
as the Lord Himself has said, ‘He that hath seen Me, hath seen the Father,’ and as John writes, ‘He who acknowledgeth the Son, hath the Father also
John xiv. 9;
1 John ii. 23. and so Cyril
in Joan. p. 864. vid. Wetstein
in loc..’
Cyril of Alexandria
https://www.elpenor.org/cyril-alexandria/john-commentary-5.asp?pg=27
And to prove that we are right in saying this, the God-beloved John will come forward as a trustworthy witness on our side, for he wrote thus:
He that denieth the Father and the Son. Whosoever denieth the Son, the same hath not the Father; he that confesseth the Son hath the Father also.
Cyril of Jerusalem
We bow our knees unto the Father from whom all fatherhood in heaven and on earth is named980980 Eph. iii. 14, 15.: glorifying Him with the Only-begotten:
for he that denieth the Father, denieth the Son also981981 1 John ii. 22: “This is the Antichrist, even he that denieth the Father and the Son” (R.V.).: and again,
He that confesseth the Son, hath the Father also knowing that Jesus Christ is Lord to the glory of God the Father
983983 Phil. ii. 11..
1. They who have been taught to believe “In One God the Father Almighty,” ought also to believe in His Only-begotten Son. For
he that denieth the Son, the same hath not the Father111
For
he that denies the Son, the same has not the Father.
https://www.newadvent.org/fathers/310110.htm
Ambrose
s. And thus he who saith that Jesus is not the Christ, the same is Antichrist; he who denies the Saviour of the world, denies Jesus; he who denies the Son, denies the Father also, for it is written; “Every one which denieth the Son, denieth the Father likewise.”
CCEL
https://www.ccel.org/ccel/schaff/npnf210.iv.iv.iv.xvi.html
Thus, He has explained what He had spoken earlier, that he who confesses the Father believes on the Son. For he who knows not the Son, neither knows the Father. For every one that denies the Son has not the Father, but he that confesses the Son has both the Father and the Son.
The Perfection of the Godhead does not admit of inequality. Love, then, Him Whom the Father loves, honour Him Whom the Father honours, for “he that honoureth not the Son, honoureth not the Father,” S.
John v. 23. and “whoso denieth the Son, hath not the Father.”
1 John ii. 23.
John Cassian
“For the Father judgeth no man, but hath committed all judgment to the Son, that all men may honour the Son as they honour the Father.” S.
John v. 22, 23. For whoever denies the Father denies the Son also. “Whosoever denieth the Son, the same hath not the Father: he that confesseth the Son, hath the Father also.”
And so if you deny that the Lord Jesus Christ is God, the result is that in denying the Son of God you deny the Father also. For as St. John says: “He who hath not the Son hath not the Father; but he who hath the Son hath the Father also.”
1 John ii. 23.
