“I once asked abu ’Abd Allah (a.s.), about a man who performs obligatory Salah (prayer) but when he raises his head from the second Sajdah (prostration) of the fourth Rak’at his Wudu’ becomes invalid. He (the Imam) said, ’His Salah (prayer) is ended; what remains is Tashahhud (testimonies of belief). Tashahhud (testimonies of belief) is Sunnah (a tradition) in Salah (prayer). He takes wudu,’ returns to his place or a clean place to say Tashahhud (testimonies of belief).”’