Psalms 50:14

14. Offer unto God thanksgiving “The calves of the lips,” says the prophet, Hosea 14:2, which the apostle calls “the sacrifice of praise to God,” Hebrews 13:15. The Hebrew reads: Sacrifice to God a todah. The todah was a praise offering, one of the species of “peace offerings,” described Leviticus 7:11-15, the fundamental idea of which was, thanksgiving to God for reconciliation, or peace, with him. So, also, the next line pay thy vows refers to the “freewill offering,” another species of “peace offering,” described in Leviticus 7:16. It was an offering which the individual had freely and voluntarily assumed. The idea of the text is, that to offer to God, from the heart, thanksgiving and praise, and to heartily fulfil their covenant vows, the things signified by the external sacrifice, is the real requirement and intent of the law, without which the form is only empty mockery. Compare 1 Samuel 15:22-23