Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "One mudd (approximately half a kilo of water) suffices for ablution, and one sa' (approximately two and a half kilos of water) suffices for the ritual bath (ghusl) of janabah." A man said to him: This (amount) is not enough for us, O Jabir! He replied: "It was enough for one who was better than you (that is, the Messenger of Allah (peace and blessings be upon him)) and had more hair than you." This hadith is sahih (authentic) on the condition of Imam Bukhari and Imam Muslim, but they did not record it with this wording.