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