"'You must count for yourselves seven weeks from the day after the Sabbath, from the day you bring the wave offering sheaf; they must be complete weeks.
"You must observe the Feast of Weeks -- the firstfruits of the harvest of wheat -- and the Feast of Ingathering at the end of the year.
"Speak to the Israelites and tell them, 'When you enter the land that I am about to give to you and you gather in its harvest, then you must bring the sheaf of the first portion of your harvest to the priest,
"'You must count off seven weeks of years, seven times seven years, and the days of the seven weeks of years will amount to forty-nine years.
You must count seven weeks; you must begin to count them from the time you begin to harvest the standing grain.
"'Also, on the day of the first fruits, when you bring a new grain offering to the Lord during your Feast of Weeks, you are to have a holy assembly. You must do no ordinary work.