It is narrated from Sayyiduna Sahl bin Sa’d (may Allah be pleased with him) that Sayyiduna Ubayy bin Ka’b (may Allah be pleased with him) related to me that the ruling people give regarding «الماء من الماء» was a concession which the Messenger of Allah (peace and blessings be upon him) granted in the early days of Islam, then afterwards he performed ghusl (full ritual bath).