What does it truly cost to offer the "sacrifice of thanksgiving" described in Psalm 116? While this ancient concept is rooted in the specific peace offerings and Levitical laws of the Old Testament, its significance for the believer today transcends mere ritual to demand a life of genuine obedience. True biblical worship is never effortless; it requires a heart prepared to offer God the very best, turning the "fruit of lips" into a living sacrifice even during life's most distressing trials. Learn how the Old Testament law illuminates our call to be thankful in all circumstances and why a grateful heart is the ultimate evidence of saving faith.

Source: https://www.gotquestions.org/sacrifice-of-thanksgiving.html