رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 975
The Book of Etiquette of Traveling
Glorification of Allah by a Traveler while Ascending and Descending
عَنْ جَابِرٍ رَضِيَ اللَّه عَنْهُ قَالَ: كُنَّا إِذَا صَعِدْنَا كَبَّرْنَا، وَإِذَا نَزَلْنَا سبحنا. ((رَوَاهُ البُخَارِيّ)).
Jabir (May Allah be pleased with him) reported: When we ascended (a height) we would proclaim: "Allahu Akbar (Allah is Greatest)," and when we descended (from the height) we would proclaim: "Subhan Allah (Allah is free from imperfection)."' [Al-Bukhari].
Riyad as-Salihin, 975