Salmos 51
Ambrose of Milan · Comentário Patrístico (catena)
Salmos 51:4
"I [the prodigal son] have sinned," he says, "against heaven and before you." He confesses what is clearly a sin to death, that you may not think that any one doing penance is rightly shut out from pardon. For one who has sinned against heaven has sinned either against the kingdom of heaven or against his own soul, which is a sin to death, and against God, to whom alone is said: "Against you only have I sinned and done evil before you." — Concerning Repentance 2.3.17
Salmos 51:7
After this white robes were given to you as a sign that you were putting off the covering of sins and putting on the chaste veil of innocence, of which the prophet said, "Purge me with hyssop, and I shall be cleansed; wash me, and I shall be made whiter than snow." For one who is baptized is seen to be purified 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 showed forth the glory of his resurrection. One, then, whose guilt is forgiven is made whiter than snow. Thus God said through Isaiah: "Though your sins are as scarlet, I will make them white as snow." — On the Mysteries 7:34