Ibrahim (may Allah have mercy on him) said: A blind man came while the Prophet (peace and blessings be upon him) was in prayer; he stumbled and fell into a well, and some of the Companions (may Allah be pleased with them) laughed. The Prophet (peace and blessings be upon him) ordered those who had laughed: "They should perform ablution again and repeat the prayer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 681