Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن ابن عمر رضي الله عنهما قال: كان النبي صلى الله عليه وسلم وجيوشه إذا علو الثنايا كبروا، وإذا هبطوا سبحوا. ((رواه أبو داود بإسناد صحيح.
Whenever the Prophet (ﷺ) and his army ascended a height, they would proclaim: "Allahu Akbar (Allah is Greatest)," and when they climbed down, they would proclaim: "Subhan Allah (Allah is free from imperfection)."[Abu Dawud].