3,117. Beginning Hilchos Matnos Aniyim

Hilchos Kilayim 10:32

If kohanim wear their “uniforms” when not performing the Temple service they are liable to lashes because the belt contains shaatnez; this is true even if they’re in the Temple. The reason is because they were only given permission to wear it while performing the service. This is a Torah obligation that overrides the prohibition of shaatnez, the same way that tzitzis does.

Hilchos Matnos Aniyim 1:1

When harvesting a field, one may not harvest the whole thing. Rather, one must leave a small section of the standing grain at the end of his field for the needy, as per Leviticus 23:22: “Do not reap the corners of your field completely when harvesting.” This applies both to reaping and to uprooting. The produce that remains is called peah.