Leviticus 23:18
And ye shall offer with the bread seven lambs without blemish of the first year, and one young bullock, and two rams: they shall be for a burnt offering unto the LORD, with their meat offering, and their drink offerings, even an offering made by fire, of sweet savour unto the LORD.
Leviticus 23:18 belongs to the law for Pentecost, which came fifty days after the offering of firstfruits and was also called the feast of harvest and the feast of weeks. Pentecost lasted only one day, which was devoted to religious service. At that feast two loaves baked with leaven were presented before God as an expression of gratitude for grain prepared as food.