Birds are divided in the Mosaic law into two classes, (1) the
clean (Lev. 1:14-17; 5:7-10; 14:4-7), which were offered in
sacrifice; and (2) the unclean (Lev. 11:13-20). When offered in
sacrifice, they were not divided as other victims were (Gen.
15:10). They are mentioned also as an article of food (Deut.
14:11). The art of snaring wild birds is referred to (Ps. 124:7;
Prov. 1:17; 7:23; Jer. 5:27). Singing birds are mentioned in Ps.
104:12; Eccl. 12:4. Their timidity is alluded to (Hos. 11:11).
The reference in Ps. 84:3 to the swallow and the sparrow may be
only a comparison equivalent to, "What her house is to the
sparrow, and her nest to the swallow, that thine altars are to
my soul." Bibliography Information Easton, Matthew George. M.A., D.D., "Biblical Meaning for 'Bird' Eastons Bible Dictionary". bible-history.com - Eastons; 1897.