Leviticus 10:10

and that ye may put difference between holy and unholy, and between unclean and clean; their minds had to be clear for the many cases which required careful distinguishing;

And thou shalt not glean thy vineyard after the first picking, neither shalt thou gather every grape of thy vineyard, those that had fallen to the ground during the picking; thou shalt leave them for the poor and stranger. I am the Lord, your God. Love toward one's neighbor was emphasized again and again as a fundamental requirement of the Law.