genesis 14

Genesis 14:20:
And praise be to God Most High, who delivered your enemies into your hand.” Then Abram gave him a tenth of everything.

Thomas Schreiner

What does the Old Testament say about tithing? Abraham gave a tenth of his spoils of war to Melchizedek (Gen. 14:20), and Hebrews appeals to this account to support the superiority of Melchizedek’s priesthood over Levi’s (Heb. 7:4–10). God met Jacob at Bethel and promised him covenant blessings; the patriarch promised God a tenth of everything granted him (Gen. 28:22).
A tenth of Israel’s seed, fruit, and flocks were given to the Lord (Lev. 27:30–32; Deut. 14:22–24; cf. 2 Chron. 31:5–6; Neh. 13:5, 12). The people gave a tenth to the Levites to support them (Num. 18:21–24; cf. Neh. 10:38; 12:44), and the Levites, in turn, were to give a tenth to the chief priest (Num. 18:25–28). Those who didn’t tithe were threatened with a curse, while those who did tithe were promised blessing (Mal. 3:8–10).

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