From him, from Muhammad ibn Khalid al-Tayalisi from Sayf ibn Umayrah from Ishaq ibn Ammar, who said: I asked Abu Ibrahim (Imam al-Kadhim عليه السلام), peace be upon him, about those who hire out animals and travel constantly, every day. Are they required to shorten (the prayer), when they are on a journey? Imam عليه السلام said: “Yes.”