Musannaf Ibn Abi Shaybah

Hazrat Abu Sanabil (may Allah have mercy on him) narrates that Sabi’ah bint Harith gave birth to a child twenty days and some after her husband’s death. When she became pure from postnatal bleeding, she adorned herself. She was reproached for this. When this matter reached the Prophet (peace be upon him), he said that if she does so, it is permissible, because her waiting period has ended.