The 303rd prohibition is that we are forbidden from embarrassing one another. This transgression is the one referred to as, "publicly humiliating one's fellowman."
The source of this commandment is G‑d's statement,1 "You must admonish your neighbor and not bear sin because of him."
In the words of the Sifra, "From where do we learn that even if you admonish someone four or five times that you should continue to admonish him? From the phrase, 'hochei'ach to'chiach.'2 One might think that one could admonish him to the point that his facial features change3 — the verse therefore continues,4 'And not bear sin because of him.'"
The simple meaning of the verse, however, is to warn that you should not think of him about the sin in your heart and [continue to] remember it.
