Birds are divided in the Mosaic law into two classes…
the clean (Leviticus 1:14-17; 5:7-10; 14:4-7), which were offered in sacrifice; and…
the unclean (Leviticus 11:13-20). When offered in sacrifice, they were not divided as other victims were (Genesis 15:10). They are mentioned also as an article of food (Deuteronomy 14:11).