And he took all the fat that was upon the inwards,.... Called the "omentum":
and the caul [above] the liver; the lobe upon the liver, as the Septuagint; or "the caul" and "the liver", so says Jarchi; the liver separately, for he took a little of the liver with it, the caul:
and the two kidneys, and their fat, and Moses burned [it] upon the altar: the fat of these several parts, which has been often observed was done; and in imitation of which, the same has been done by the Persians and their Magi, as related by Strabo x and others y; and by the Romans, to which Persius z refers; and these several parts are generally covered with fat in fat creatures, and especially sheep, as Aristotle a observes.
x Geograph. l. 15. p. 504. y "Omentum in flamma pingue", &c. Catullus. z "Tot tibi cum in flammis", &c. Satyr. 2. a Hist. Animal. l. 3. c. 17.