Allah has made the Kaaba, the sacred house, a maintenance for the people, and the sacred month and the offerings and the sacrificial animals with garlands; this is that you may know that Allah knows whatever is in the heavens and whatever is in the earth, and that Allah is the Knower of all things.

And (as for) those of your women who have despaired of menstruation, if you have a doubt, their prescribed time shall be three months, and of those too who have not had their courses; and (as for) the pregnant women, their prescribed time is that they lay down their burden; and whoever is careful of (his duty to) Allah He will make easy for him his affair.