It is narrated from al-Hasan (may Allah have mercy on him) that the Prophet (peace and blessings be upon him) was leading the people in prayer when a blind man came and fell into the well of the mosque. (Seeing this,) some people laughed. When the Prophet (peace and blessings be upon him) said the salam, he ordered that "they should perform ablution again and repeat the prayer."
(b) Ma'bad al-Juhani (may Allah have mercy on him) narrates it from the Prophet (peace and blessings be upon him) as mursal. Ma'bad (may Allah have mercy on him) was not a Companion; rather, he was the first person to debate predestination (qadar) in Basrah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 680