'Weeks' in the Bible

But if she gives birth to a female child, then she shall be unclean for two weeks, as during her monthly period, and she shall remain [intimately separated] sixty-six days to be purified from the blood.

‘You shall count from the day after the Sabbath, from the day when you brought in the sheaf (tied bundle of grain) of the wave offering; there shall be seven complete Sabbaths (seven full weeks).

‘You are also to count off seven Sabbaths of years for yourself, seven times seven years, so that you have the time of the seven Sabbaths of years, namely, forty-nine years.