Musannaf Ibn Abi Shaybah 34284 — The virtues of Ali bin Abi Talib

Ulaym (may Allah have mercy on him) said that Sayyiduna Salman (may Allah be pleased with him) said: "The first person of this Ummah who will come to its Prophet (peace and blessings be upon him) is the one who was first to embrace Islam, Sayyiduna Ali bin Abi Talib (may Allah be pleased with him)."