Come now, and let us reason together,
says the LORD:
though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.
All Commentaries on Isaiah 1:18 Go To Isaiah 1
Ambrose of Milan
AD 397
[One] who is baptized is seen to be purified both according to the law and according to the gospel. According to the law, because Moses sprinkled the blood of the lamb with a bunch of hyssop; according to the gospel, because Christ’s garments were white as snow, when in the gospel he manifested the glory of his resurrection, [one] then whose guilt is remitted is made whiter than snow.