It was narrated that Jarir bin 'Abdullah Al-Bajali said:
"The Messenger of Allah never refused to see me from the time I became Muslim, and whenever he saw me he would smile at me. I complained to him that I could not sit firmly on a horse, so he struck me on the chest with his hand and said: 'O Allah, make him firm and cause him to guide others and be rightly-guided.'"
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ، عَنْ قَيْسِ بْنِ أَبِي حَازِمٍ، عَنْ جَرِيرِ بْنِ عَبْدِ اللَّهِ الْبَجَلِيِّ، قَالَ مَا حَجَبَنِي رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ مُنْذُ أَسْلَمْتُ وَلاَ رَآنِي إِلاَّ تَبَسَّمَ فِي وَجْهِي وَلَقَدْ شَكَوْتُ إِلَيْهِ أَنِّي لاَ أَثْبُتُ عَلَى الْخَيْلِ فَضَرَبَ بِيَدِهِ فِي صَدْرِي فَقَالَ ‏ "‏ اللَّهُمَّ ثَبِّتْهُ وَاجْعَلْهُ هَادِيًا مَهْدِيًّا ‏"‏ ‏.‏
GradeSahih (Darussalam)
English reference : Vol. 1, Book 1, Hadith 159
Arabic reference : Book 1, Hadith 164