From him, by Ayyub ibn Nuh by Ibn Abi Umayr by Hammad ibn Uthman by al-Halabi from Abu Abdillah عليه السلام: Imam al-Sadiq عليه السلام was asked regarding a man who travels and passes by a house of his, on the road. Should he complete the prayer or shorten it? Imam عليه السلام said: “He should shorten (the prayers). Prayer is only (performed in full) in the house that he has settled in permanently (‘tawattanahu’).”