'Weeks' in the Bible

But if she bear a maid child, then she shall be unclean two weeks, as in her separation: and she shall continue in the blood of her purifying threescore and six 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.

"Count for yourselves seven years of Sabbaths seven times seven years. This set of seven weeks of years total 49 years for you.