'Weeks' in the Bible
“Observe the Festival of Weeks with the firstfruits of the wheat harvest, and the Festival of Ingathering at the turn of the agricultural year.
But if she gives birth to a female child, she will be unclean for two weeks as she is during her menstrual impurity. She will continue in purification from her bleeding for 66 days.
“You are to count seven complete weeks starting from the day after the Sabbath, the day you brought the sheaf of the presentation offering.
“On the day of firstfruits, you are to hold a sacred assembly when you present an offering of new grain to the Lord at your Festival of Weeks; you are not to do any daily work.
“You are to count seven weeks, counting the weeks from the time the sickle is first put to the standing grain.
You are to celebrate the Festival of Weeks to the Lord your God with a freewill offering that you give in proportion to how the Lord your God has blessed you.
“All your males are to appear three times a year before the Lord your God in the place He chooses: at the Festival of Unleavened Bread, the Festival of Weeks, and the Festival of Booths. No one is to appear before the Lord empty-handed.
He followed the daily requirement for offerings according to the commandment of Moses for Sabbaths, New Moons, and the three annual appointed festivals: the Festival of Unleavened Bread, the Festival of Weeks, and the Festival of Booths.
They have not said to themselves,‘Let’s fear the Lord our God,who gives the rain, both early and late, in its season,who guarantees to us the fixed weeks of the harvest.’
Seventy weeks are decreedabout your people and your holy city—to bring the rebellion to an end,to put a stop to sin,to wipe away iniquity,to bring in everlasting righteousness,to seal up vision and prophecy,and to anoint the most holy place.
Know and understand this:From the issuing of the decreeto restore and rebuild Jerusalemuntil Messiah the Princewill be seven weeks and 62 weeks.It will be rebuilt with a plaza and a moat,but in difficult times.
After those 62 weeksthe Messiah will be cut offand will have nothing.The people of the coming princewill destroy the city and the sanctuary.The end will come with a flood,and until the end there will be war;desolations are decreed.
In those days I, Daniel, was mourning for three full weeks.
I didn’t eat any rich food, no meat or wine entered my mouth, and I didn’t put any oil on my body until the three weeks were over.