Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Comprehensive and final words have been granted to me." We said: O Messenger of Allah! Teach us some of what Allah Almighty has taught you. So he (peace and blessings of Allah be upon him) taught us the Tashahhud.