Yahya related to me from Malik from Nafi that he used to travel one mail-stage with Ibn Umar, and he would not shorten the prayer.
Muwatta Malik Book 9, Hadith 17
← Previous Hadith Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah that Abdullah ibn Umar used to shorten the prayer when he travelled for a whole day.

Muwatta Malik Book 9, Hadith 16 Next Hadith → Yahya related to me from Malik that he had heard that Abdullah ibn Abbas used to shorten the prayer when he travelled a distance equivalent to that between Makka and Ta'if, and that between Makka and Usfan and that between Makka and Jedda.

Malik said, "That is four mail-stages, and to me that is the most preferable distance for shortening the prayer."

Malik said, "Someone who intends to travel does not shorten the prayer until he has left the houses of the village. And he does not do it in full until he comes to the first houses of the village, or is nearby."

Muwatta Malik Book 9, Hadith 18