The thank offering (Hebrew: תֹּודָה, pronounced Todah) or sacrifice of thanksgiving (Hebrew zevakh hatodah זֶבַח הַתֹּודָה ) was an optional offering under the Law of Moses.The international standard Bible encyclopedia - Page 268 Geoffrey W. Bromiley 1995 "The thank offering (zebah hattodd) called for a cereal offering to accompany the animal sacrifice. Its purpose was to render an expression of thanks for deliverance or blessings granted. No previous promise or vow was involved" This is also termed the "thanksgiving offering."The Jewish Study Bible: Featuring The Jewish Publication Society Adele Berlin, Marc Zvi Brettler, Michael Fishbane - 2003 "17 applies to the thanksgiving offering as well but would take place on the second day"
The Hebrew noun todah "thanksgiving" is derived from the Hiphil of the verb yadah (יָדָה) "to praise." References
External links From Jewish Passover to Christian Eucharist: The Story of the Todah, by the Catholic Education Resource Center