Al-Zubayr bin Bakkar said: Before the Messenger of Allah (peace and blessings be upon him), Umm Salamah (may Allah be pleased with her) was married to Abu Salamah Abdullah bin Abd al-Asad, and she bore him Salamah, Umar and Zaynab. Then Abu Salamah died, and the Messenger of Allah (peace and blessings be upon him) married her.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19800