Matthew 12:48

Tertullian Against Marcion Book IV

They say that He testifies Himself to His not having been born, when He asks, "Who is my mother, and who are my brethren? "[714]

Tertullian On the Flesh of Christ

But whenever a dispute arises about the nativity, all who reject it as creating a presumption in favour of the reality of Christ's flesh, wilfully deny that God Himself was born, on the ground that He asked, "Who is my mother, and who are my brethren? "[100]