It is narrated from Hazrat Abu Ruh (may Allah be pleased with him) that once the Noble Prophet (peace and blessings be upon him) led us in prayer in which he recited Surah Rum. During the recitation, something became confusing for him. After the prayer, the Noble Prophet (peace and blessings be upon him) said that Satan caused confusion for us during the recitation because of those people who come to prayer without ablution. Therefore, when you come for prayer, perform ablution thoroughly.