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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).
The art of snaring wild birds is referred to (Psalms 124:7; Proverbs 1:17; 7:23; Jeremiah 5:27).
Singing birds are mentioned in Psalms 104:12; Eccl. 12:4.
Their timidity is alluded to (Hos. 11:11).
The reference in Psalms 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.”