Numbers 15:8

i.e. Or any other peace-offerings, to wit, such as were offered either freely or by command, which may be called peace-offerings or thank-offerings, by way of eminency, because such are offered purely by way of gratitude to God, and with single respect to his command and honour; whereas the peace-offerings made it performance of a vow were made and offbred by way of contract, and with design of getting some advantage by them.