Leviticus 7:31

And the priest shall burn the fat upon the altar,.... Of burnt offering, even the fat upon the inwards, the two kidneys, the flanks, the caul, and liver:

but the breast shall be Aaron's and his sons; which being waved before the Lord for a wave offering, was the Lord's, and so was given to his priests to eat of, for the service done by them, it being but reasonable that they that serve at the altar should live of it; and thus, with other things, a maintenance was provided for the priests and their families, as ought also to be for Gospel ministers under the present dispensation.