Levítico 23

15 And you have numbered for yourselves from the day after the Sabbath, from the day of your bringing in the sheaf of the wave-offering: they are seven perfect Sabbaths; 22 And in your reaping the harvest of your land you do not complete the corner of your field in your reaping, and you do not gather the gleaning of your harvest, you leave them for the poor and for the sojourner; I [am] your God YHWH."