Hadith 2771
Chapter 8: The virtue of guarding the frontiers and saying the Takbir in the cause of Allah - كتاب الجهاد
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ أُسَامَةَ بْنِ زَيْدٍ، عَنْ سَعِيدٍ الْمَقْبُرِيِّ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ لِرَجُلٍ " أُوصِيكَ بِتَقْوَى اللَّهِ وَالتَّكْبِيرِ عَلَى كُلِّ شَرَفٍ " .
It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said to a man:
“I advise you to fear Allah and to say the Takbir (Allahu Akbar) in every high place.”
Reference : Sunan Ibn Majah 2771
In-book reference : Book 24, Hadith 19