2:226
For those who swear (off) from their wives (is a) waiting (of) four months, then if they return - then indeed, Allah (is) Oft-Forgiving, Most Merciful.
2:234
And those who pass away among you and leave behind wives, (the widows) should wait for themselves (for) four months and ten (days). Then when they reach their (specified) term, then (there is) no blame upon you for what they do concerning themselves in a fair manner. And Allah of what you do (is) All-Aware.
9:2
So move about in the land (during) four months but know that you (can) not escape Allah and that Allah (is) the One Who (will) disgra the disbelievers.
65:4
And those who have despaired of the menstruation among your women, if you doubt, then their waiting period (is) three months, and the ones who not [they] menstruated. And those who (are) pregnant, their term until they deliver their burdens. And whoever fears Allah, He will make for him of his affair ease.