We were with the Prophet ﷺ on a journey, and whenever we ascended a high place, we used to say, "Allahu Akbar." The Prophet ﷺ said, "Don't trouble yourselves too much! You are not calling a deaf or an absent person, but you are calling One Who Hears, Sees, and is very near." Then he came to me while I was saying in my heart, "La hawla wala quwwatta illa billah (There is neither might nor power but with Allah)." He said, to me, "O ʿAbdullah bin Qais! Say, 'La hawla wala quwwata illa billah (There is neither might nor power but with Allah), for it is one of the treasures of Paradise." Or said, "Shall I tell you of it?"  

كُنَّا مَعَ النَّبِيِّ ﷺ فِي سَفَرٍ فَكُنَّا إِذَا عَلَوْنَا كَبَّرْنَا فَقَالَ ارْبَعُوا عَلَى أَنْفُسِكُمْ فَإِنَّكُمْ لاَ تَدْعُونَ أَصَمَّ وَلاَ غَائِبًا تَدْعُونَ سَمِيعًا بَصِيرًا قَرِيبًا ثُمَّ أَتَى عَلَىَّ وَأَنَا أَقُولُ فِي نَفْسِي لاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ فَقَالَ لِي يَا عَبْدَ اللَّهِ بْنَ قَيْسٍ قُلْ لاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ فَإِنَّهَا كَنْزٌ مِنْ كُنُوزِ الْجَنَّةِ أَوْ قَالَ أَلاَ أَدُلُّكَ بِهِ  

Abu Bakr As-Siddiq said to the Prophet ﷺ "O Messenger of Allah ﷺ! Teach me an invocation with which I may invoke Allah in my prayers." The Prophet ﷺ said, "Say: O Allah! I have wronged my soul very much (oppressed myself), and none forgives the sins but You; so please bestow Your Forgiveness upon me. No doubt, You are the Oft-Forgiving, Most Merciful."  

أَنَّ أَبَا بَكْرٍ الصِّدِّيقَ ؓ قَالَ لِلنَّبِيِّ ﷺ يَا رَسُولَ اللَّهِ عَلِّمْنِي دُعَاءً أَدْعُو بِهِ فِي صَلاَتِي قَالَ قُلِ اللَّهُمَّ إِنِّي ظَلَمْتُ نَفْسِي ظُلْمًا كَثِيرًا وَلاَ يَغْفِرُ الذُّنُوبَ إِلاَّ أَنْتَ فَاغْفِرْ لِي مِنْ عِنْدِكَ مَغْفِرَةً إِنَّكَ أَنْتَ الْغَفُورُ الرَّحِيمُ  

The Prophet ﷺ said, "Gabriel called me and said, 'Allah has heard the statement of your people and what they replied to you.'"  

قَالَ النَّبِيُّ ﷺ إِنَّ جِبْرِيلَ عَلَيْهِ السَّلاَمُ نَادَانِي قَالَ إِنَّ اللَّهَ قَدْ سَمِعَ قَوْلَ قَوْمِكَ وَمَا رَدُّوا عَلَيْكَ