Abu Dawud Book 35, Hadith Number 4728.

Narated By Zayd ibn Arqam : We were with the Apostle of Allah (PBUH). He said when we arrived at a halting place: You are not a hundred thousandth part of those who will come down to me at the pond. I (the narrator AbuHamzah) asked: What was your number that day? He replied: Seven or eight hundred.