Origen
Catena Aurea · Matthäusevangelium 18
Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times? Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.
Or, because the number six seems to denote toil and labour, and the number seven repose, He says that forgiveness should be given to all brethren who live in this world, and sin in the things of this world. But if any commit transgressions beyond these things, he shall then have no further forgiveness.