Leviticus 22:29 KJV
And when ye will offer a sacrifice of thanksgiving unto the Lord, offer it at your own will.
Leviticus 22:29, King James Version
In context
28 And whether it be cow or ewe, ye shall not kill it and her young both in one day.
29 And when ye will offer a sacrifice of thanksgiving unto the Lord, offer it at your own will.
30 On the same day it shall be eaten up; ye shall leave none of it until the morrow: I am the Lord.