Maliks Muwatta Book 28, Hadith Number 45.

Section : Marriage of Idol Worshippers when their Wives become Muslim before Them.

Yahya related to me from Malik that Ibn Shihab said, “Between the Islam of Safwan and the Islam of his wife there was about one month.”

Ibn Shihab said, “We have not heard about any woman doing hijra for Allah and His Messenger while her husband was a kafir abiding in the land of kufr, but that her hijra separated her and her husband unless her husband came in hijra before her period of idda had been completed.”