Leviticus 22:19

Ye shall offer at your own will,.... For vows and freewill offerings were at their own option, and depended on their own will and pleasure, and when offered should be with a willing mind, and from their whole heart: or "for good will to you"; as the Targums of Onkelos and Jonathan; or for gracious, acceptation, that is, that they might be well pleasing to God, and acceptable in his sight, so Jarchi; in order to which the following direction was strictly to be observed:

a male without blemish, of the beeves, of the sheep, and of the goats; bullocks, sheep, and goats, were the only sorts of beasts, out of which sacrifices were taken, and those that were for burnt offerings were always to be males, and unblemished, see Leviticus 1:3; but for other offerings, as peace offerings and sin offerings, females might be used, see Leviticus 3:1. Fowls are not mentioned, though burnt offerings were of them, because it was not required in them, only of beasts, that they should be males, and without blemish; for, as Jarchi observes, these were not rejected on account of a blemish, only for want of a member.