The 211th prohibition is that we are forbidden from taking for ourselves the stalks which fall 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 the stalks which fall during harvest."
This mitzvah is also in the category of lav shenitak l'aseh (a prohibition with a remedial positive commandment), as explained regarding pe'ah.2
The details of this mitzvah are explained in tractate Pe'ah.
