Riyad as-Salihin

Riyad as-Salihin 976

Glorification of Allah by a Traveler while Ascending and Descending
The Book of Etiquette of Traveling Search within the hadiths
Riyad as-Salihin 976
Arabic hadith text
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.‏
Translation
Ibn 'Umar (May Allah be pleased with them) reported

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].