And those of you who die and leave wives behind them, they (the wives) shall wait (as regards their marriage) for four months and ten days, then when they have fulfilled their term, there is no sin on you if they (the wives) dispose of themselves in a just and honourable manner (i.e. they can marry). And Allâh is Well-Acquainted with what you do. (2:234)

O you who believe! When you marry believing women, and then divorce them before you have sexual intercourse with them, no 'Iddah [divorce prescribed period, see (V.65:4)] have you to count in respect of them. So give them a present, and set them free i.e. divorce, in a handsome manner. (33:49)

And those of your women as have passed the age of monthly courses, for them the 'Iddah (prescribed period), if you have doubts (about their periods), is three months, and for those who have no courses [(i.e. they are still immature) their 'Iddah (prescribed period) is three months likewise, except in case of death]^[] . And for those who are pregnant (whether they are divorced or their husbands are dead), their 'Iddah (prescribed period) is until they deliver (their burdens), and whosoever fears Allâh and keeps his duty to Him, He will make his matter easy for him. (65:4)

That is the Command of Allâh, which He has sent down to you, and whosoever fears Allâh and keeps his duty to Him, He will remit his sins from him, and will enlarge his reward. (65:5)