Leviticus 23:9-12

Then the LORD spoke to Moses, saying, “Speak to the children of Israel and say to them, ‘When you enter the land which I am giving you and reap its harvest, you shall bring the sheaf of the first fruits of your harvest to the priest. He shall wave the sheaf before the LORD so that you may be accepted; the priest shall wave it on the day after the Sabbath. Now on the day when you wave the sheaf you shall offer a male lamb one year old without blemish as a burnt offering to the LORD.