Gregory the Great
Catena Aurea · Matthäusevangelium 13
Jesus saith unto them, Have ye understood all these things? They say unto him, Yea, Lord. Then said he unto them, Therefore every Scribe which is instructed unto the kingdom of heaven is like unto a man that is an householder, which bringeth forth out of his treasure things new and old.
(ubi sup.) But if by things new and old in this passage we understand the two Testaments, we deny Abraham to have been learned, who although he knew indeed some deeds of the Old Testament, yet had not read the words. Neither Moses may we compare to a learned householder, for although he composed the Old Testament, yet had he not the words of the New. But what is here said may be understood as meant not of those who had been, but of such as might hereafter be in the Church, whothen bring forth things new and old when they speak the preachings of both Testaments, in their words and in their lives.