(63) باب التَّزْوِيجِ عَلَى الإِسْلاَمِ .
It was narrated that Anas said:
"Abu Talhah married Umm Sulaim and the dowry between them was Islam. Umm Sulaim became Muslim before Abu Talhah, and he proposed to her but she said: 'I have become Muslim; if you become Muslim I will marry you.' So he became Muslim, and that was the dowry between them."
Reference: Sunan an-Nasa'i 3340
In-book reference: Book 26, Hadith 145
English translation: Vol. 4, Book 26, Hadith 3342