Lady Aisha (may Allah be pleased with her) narrates: Once the Prophet Muhammad (peace and blessings be upon him) urinated, so Umar (may Allah be pleased with him) brought a vessel of water. The Prophet (peace and blessings be upon him) said: "I have not been commanded to do this, that whenever I urinate I should immediately perform ablution. If I do this, it will become a Sunnah." This narration has also been transmitted with another chain of narration.