Quran 2:234 – Surah Al-Baqarah (The Cow)

And those of you who pass away, die, leaving, behind, wives, they shall wait by themselves, after their death, refraining from marriage, for four months and ten, nights: this applies to women who are not pregnant. The waiting period in the case of pregnant women is for them to give birth — as stated by a verse in sūrat al-Talāq [Q. 65:4]. The slavegirl must wait for half this period [of four months] according to the Sunna; when they have reached, completed, their term, of waiting, then you would not be at fault, O guardians, regarding what they may do with themselves, in the way of adorning themselves and offering themselves before suitors, honourably, in accordance with the Law; God is aware of what you do, both secretly and openly.