Deuteronomy 16:10 And thou shalt hold the feast of weeks to Jehovah thy God with a tribute of a voluntary-offering of thy hand, which thou shalt give, according as Jehovah thy God hath blessed thee; (DBY)
Deuteronomy 23:23 What is gone out of thy lips thou shalt keep and do, as thou hast vowed to Jehovah thy God, the voluntary-offering that thou hast promised with thy mouth. (DBY)