Silsilah as-Sahihah 3204 — The Prophet’s ummah will be the largest

Sayyiduna Samurah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Every prophet will have a cistern, and the prophets will boast among themselves about the number of people who come to them. I hope that the number of people who come to my cistern will be the greatest."