Treasury of Scripture Knowledge
"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 observe the Feast of Weeks -- the firstfruits of the harvest of wheat -- and the Feast of Ingathering at the end of the year.
You must count seven weeks; you must begin to count them from the time you begin to harvest the standing grain.