It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him); he said: We were with the Messenger of Allah (peace and blessings be upon him) when he (peace and blessings be upon him) said: "You are one part out of a hundred thousand parts of those who will come to me at the Pond (al-Hawd)." (Abu Hamzah says:) I asked (Sayyiduna Zayd (may Allah be pleased with him)): "How many were you that day?" He said: "Seven hundred or eight hundred men."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4978