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قَالَ جَابِرٌ رضي الله عنه: كُنَّا إِذَا صَعَدْنَا كَبَّرْنَا, وَإِذَا نَزَلْنَا سَبَّحْنَا
Jabir said: Whenever we went up a hill we would say Allaahu 'Akber (Allah is the Most Great) and when we descended we would say Subhaanallaah (Glory is to Allah)
Source: Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 6/135.