Musnad Abi Ya'la 70 — Sayyiduna Abu Bakr came to the Prophet ﷺ while

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that Sayyiduna Abu Bakr (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him) while he was very sad, so the Prophet (peace and blessings be upon him) asked him: "What is the matter, that I see you grieved?" He said: O Messenger of Allah! Last night I was with a cousin of mine who was in the throes of death, giving up his soul. He (peace and blessings be upon him) said: "Did you not prompt him to say La ilaha illallah (there is none worthy of worship except Allah)?" He said: O Messenger of Allah! I did prompt him. He (peace and blessings be upon him) asked: "And did he say this word?" He said: Yes. He (peace and blessings be upon him) said: "Paradise has become obligatory for him." Sayyiduna Abu Bakr (may Allah be pleased with him) said: O Messenger of Allah! What is the virtue of this word for the living? He (peace and blessings be upon him) said: "It is the greatest effacer of their sins; it is the greatest effacer of their sins."