Muhammad ibn Yaqub, from Muhammad ibn Yahya, from Muhammad ibn al-Husayn, from Safwan ibn Yahya, from al-Ala ibn Razin, from Muhammad ibn Muslim, who said: I (narrator) said to Abu Abdillah عليه السلام, peace be upon him: “A man intends to travel; when does he shorten (the prayer)?” Imam عليه السلام said: “When he disappears from the houses.” He (narrator) said: “I asked, ‘A man intends to travel, then he leaves when the sun declines.’” Imam عليه السلام said: “When you leave, pray two rakahs.”