Leviticus 23:9-21 Then the LORD spoke to Moses, saying, 10 “Speak to the sons of Israel and say to them, ‘When you enter the land which I am going to give to you and reap its harvest, then you shall bring in the sheaf of the first fruits of your harvest to the priest. 11 ‘He shall wave the sheaf before the LORD for you to be accepted; on the day after the sabbath the priest shall wave it. 12 ‘Now on the day when you wave the sheaf, you shall offer a male lamb one year old without defect for a burnt offering to the LORD. 13 ‘Its grain offering shall then be twotenths of an ephah of fine flour mixed with oil, an offering by fire to the LORD for a soothing aroma, with its drink offering, a fourth of a hin of wine. 14 ‘Until this same day, until you have brought in the offering of your God, you shall eat neither bread nor roasted grain nor new growth. It is to be a perpetual statute throughout your generations in all your dwelling places. 15 ‘You shall also count for yourselves from the day after the sabbath, from the - 1 - day when you brought in the sheaf of the wave offering; there shall be seven complete sabbaths. 16 ‘You shall count fifty days to the day after the seventh sabbath; then you shall present a new grain offering to the LORD. 17 ‘You shall bring in from your dwelling places two loaves of bread for a wave offering, made of two-tenths of an ephah; they shall be of a fine flour, baked with leaven as first fruits to the LORD. 18 ‘Along with the bread you shall present seven one year old male lambs without defect, and a bull of the herd and two rams; they are to be a burnt offering to the LORD, with their grain offering and their drink offerings, an offering by fire of a soothing aroma to the LORD. 19 ‘You shall also offer one male goat for a sin offering and two male lambs one year old for a sacrifice of peace offerings. 20 ‘The priest shall then wave them with the bread of the first fruits for a wave offering with two lambs before the LORD; they are to be holy to the LORD for the priest. 21 ‘On this same day you shall make a proclamation as well; you are to have a holy convocation. You shall do no laborious work. It is to be a perpetual statute in all your dwelling places throughout your generations. Deuteronomy 16:9-12 “You shall count seven weeks for yourself; you shall begin to count seven weeks from the time you begin to put the sickle to the standing grain. 10 “Then you shall celebrate the Feast of Weeks to the LORD your God with a tribute of a freewill offering of your hand, which you shall give just as the LORD your God blesses you; 11 and you shall rejoice before the LORD your God, you and your son and your daughter and your male and female servants and the Levite who is in your town, and the stranger and the orphan and the widow who are in your midst, in the place where the LORD your God chooses to establish His name. 12 “You shall remember that you were a slave in Egypt, and you shall be careful to observe these statutes." The command to count the Omer is referred to as Sifrat HaOmer. We find this concept for the counting of the sheaf or omer in Leviticus 23:15 above. What is interesting is that many scholars find the use of Shabbatot in our Levitical passage to refer to weeks, or periods of seven days. In Deuteronomy we find the more typical word for "weeks" which is Shavuot, תֹעֻ בָ שׁ .This word is used throughout the description in Deuteronomy. You count weeks in Deuteronomy from the time you begin to put the sickle into the standing grain.