The 213th prohibition is that we are forbidden from gathering the grapes which fall in the vineyard during the harvesting process. Rather, they must be left for the poor.
The source of this commandment is G‑d's statement,1 "Do not pick up peret in your vineyard.
This mitzvah is also in the category of lav shenitak l'aseh (a prohibition with a remedial positive commandment).
The details of this mitzvah are explained in tractate Pe'ah.2
