'Weeks' in the Bible
"You shall observe the feast of weeks with the first fruits of wheat harvest, and the feast of harvest at the year's end.
But if she bears a female child, then she shall be unclean two weeks, as in her period; and she shall continue in the blood of purification sixty-six days.
"'Also in the day of the first fruits, when you offer a new meal offering to Yahweh in your [feast of] weeks, you shall have a holy convocation; you shall do no servile work;
You shall count for yourselves seven weeks: from the time you begin to put the sickle to the standing grain you shall begin to number seven weeks.
You shall keep the feast of weeks to Yahweh your God with a tribute of a freewill offering of your hand, which you shall give, according as Yahweh your God blesses you:
Three times in a year shall all your males appear before Yahweh your God in the place which he shall choose: in the feast of unleavened bread, and in the feast of weeks, and in the feast of tents; and they shall not appear before Yahweh empty:
even as the duty of every day required, offering according to the commandment of Moses, on the Sabbaths, and on the new moons, and on the set feasts, three times in the year, [even] in the feast of unleavened bread, and in the feast of weeks, and in the feast of tents.
Neither do they say in their heart, 'Let us now fear Yahweh our God, who gives rain, both the former and the latter, in its season; who preserves to us the appointed weeks of the harvest.'
Seventy weeks are decreed on your people and on your holy city, to finish disobedience, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up vision and prophecy, and to anoint the most holy.
Know therefore and discern, that from the going forth of the commandment to restore and to build Jerusalem to the Anointed One, the prince, shall be seven weeks, and sixty-two weeks: it shall be built again, with street and moat, even in troubled times.
After the sixty-two weeks the Anointed One shall be cut off, and shall have nothing: and the people of the prince who shall come shall destroy the city and the sanctuary; and its end shall be with a flood, and even to the end shall be war; desolations are determined.
In those days I, Daniel, was mourning three whole weeks.
I ate no pleasant bread, neither came flesh nor wine into my mouth, neither did I anoint myself at all, until three whole weeks were fulfilled.