Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates: One day we were walking with the Prophet (peace and blessings of Allah be upon him) when he passed by the house of an Ansari (may Allah be pleased with him). The Prophet (peace and blessings of Allah be upon him) said: Where is so-and-so? The narrator says, then the Prophet (peace and blessings of Allah be upon him) called for him, and that person quickly came out from inside, with water dripping from his head. The Prophet (peace and blessings of Allah be upon him) said: Perhaps we forced you to hurry because of your need. That person said: Yes, by Allah! O Messenger of Allah, I had to hurry. So the Prophet (peace and blessings of Allah be upon him) said: If someone has to do something quickly or is short on time, then ghusl is not obligatory upon him. In that case, performing wudu is obligatory.