Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) relates: We did not know what to say when we sat in the prayer, and the Messenger of Allah (peace and blessings be upon him) had been taught comprehensive and complete words. He (peace and blessings be upon him) taught us the tashahhud, and he also taught us these words: 'Allahumma allif bayna qulubina, wa aslih dhata baynina, wahdina subulas-salam, wa najjina minaz-zulumati ilan-nur, wa jannibnal-fawahisha ma zahara minha wa ma batan, wa barik lana fi asma'ina wa absarina wa qulubina wa azwajina wa dhurriyyatina, wa tub 'alayna innaka antat-Tawwabur-Rahim, waj'alna shakirina li-ni'matika, muthnina biha 'alayka, qabiliha, wa atmimha 'alayna' (O Allah, create affection between our hearts, set right our mutual affairs, guide us to the paths of peace, bring us out of the darknesses into the light, keep us away from indecencies, whether open or hidden, bless us in our hearing, our sight, our hearts, our wives and our children, and accept our repentance; indeed You are the Accepter of repentance, the Most Merciful. Make us grateful for Your blessings, praising You for them and accepting them, and complete them upon us). This hadith is sahih on the condition of Muslim, but the two Shaykhs did not record it.