2:197The Hajj is during specific months. Whoever decides to perform the Hajj—there shall be no sexual relations, nor misconduct, nor quarrelling during the Hajj. And whatever good you do, God knows it. And take provisions, but the best provision is righteousness. And be mindful of Me, O people of understanding.

2:226Those who vow abstinence from their wives must wait for four months. But if they reconcile—God is Forgiving and Merciful.

2:234As for those among you who die and leave widows behind, their widows shall wait by themselves for four months and ten days. When they have reached their term, there is no blame on you regarding what they might honorably do with themselves. God is fully acquainted with what you do.