Sahih al-Bukhari, Volume 2, Book 26, Hadith 602 (USC-MSA) ⓘ
Narrated Salim from his father who said: "The Prophet had fixed the Mawaqit as follows: (No. 603)
حَدَّثَنَا عَلِيٌّ، حَدَّثَنَا سُفْيَانُ، حَفِظْنَاهُ مِنَ الزُّهْرِيِّ عَنْ سَالِمٍ، عَنْ أَبِيهِ، وَقَّتَ النَّبِيُّ صلى الله عليه وسلم.
also referenced under: Book 25, Hadith 15 (In-Book) & Hadith 1527 (DarusSalam)