Abba Chanan says in the name of R. Elazar: Scripture speaks of leket, shikchah, and peah (i.e., it is "in his quarrel" that you are not to honor a poor man, but you are to honor him by deciding in his favor in instances of doubt as to whether something is leket, shikchah or peah, [which revert to the poor] viz. Leviticus 23:22.)
Abba Chanan says in the name of R
Mekhilta Tractate Kaspa 2:21