Nehemiah 10:35; Nehemiah 10:36

35 We obligate ourselves to bring the firstfruits of our ground and the firstfruits of all fruit of every tree, year by year, to the house of the LORD;

36 also to bring to the house of our God, to the priests who minister in the house of our God, the firstborn of our sons and of our cattle, as it is written in the Law, and the firstborn of our herds and of our flocks;