(181) باب كِتَابَةِ الإِمَامِ النَّاسَ
Narrated Al-A`mash:
"We (listed the Muslims and) found them five hundred." And Abu Muawiya said, "Between sixhundred to seven-hundred."
Reference: Sahih al-Bukhari 3060
In-book reference: Book 56, Hadith 266
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 294