Maliks Muwatta Book 29, Hadith Number 65.

Section : Idda of Women in their Houses when Divorced in Them.

Yahya related to me from Malik from Nafi that Abdullah ibn Umar divorced one of his wives in the house of Hafsa, the wife of the Prophet, may Allah bless him and grant him peace, while he was on the way to the mosque. He went another route from behind the houses being averse to ask permission to enter until he returned to her.