Bede the Venerable
Catena Aurea · Johannesevangelium 1
He came unto his own, and his own received him not. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
It should be understood that in holy Scripture, blood in the plural number, has the signification of sin: thus in the Psalms Deliver me from blood-guiltinessp. (Ps. 51:14).