Muhammad ibn al-Hasan al-Saffar narrated from Muhammad ibn Isa, from al-Qasim ibn al-Sayqal, who said: I wrote to Imam عليه السلام: 'May I be your ransom, did the Commander of the Faithful عليه السلام perform ghusl when He عليه السلام washed the Messenger of Allah سبحانه وتعالى (peace and blessings be upon him and his family) after his death?' Imam عليه السلام replied: 'The Prophet (peace and blessings be upon him and his family) is pure and purified, but the Commander of the Faithful عليه السلام performed ghusl, and it became a practice (sunnah).'"