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It sometimes denotes the best of any production (Genesis 45:18; Num. 18:12; Ps. 81:16). The fat of sacrifices was to be burned (Lev. 3:9-11; 4:8; 7:3; 8:25; Num. 18:17. Compare Ex. 29:13-22; Lev. 3:3-5).
It is used figuratively for a dull, stupid state of mind (Psalms 17:10).