Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: Sayyidah Zaynab (may Allah be pleased with her), the daughter of the Prophet (peace and blessings be upon him), accepted Islam while her husband Abu al-As bin al-Rabi' was a polytheist. Then he accepted Islam later, and the Prophet (peace and blessings be upon him) kept them upon their first marriage.
Hadith Referenceالمعجم الكبير للطبراني / باب اللام / 16503