Uqba bin Amir reported,
I heard the Messenger of Allah ﷺ say, "Your Lord 
marvels at a shepherd of sheep on the peak of a mountain crag who calls the adhan and prays. Allah says, 'Look at this servant of Mine, calling the adhan and the iqamah for prayer out of fear of Me. I have forgiven My servant and admitted him into Paradise.'"
Azami 381
Sahihعن عقبة بن عامر قال
سمعت رسول الله ﷺ يقول: يعجب ربك عز وجل من راعي غنم في رأس شظيئة بجبل يؤذن للصلاة ويصلي. فيقول الله عز وجل: انظروا إلى عبدي هذا يؤذن ويقيم للصلاة يخاف مني، قد غفرت لعبدي وأدخلته الجنة.
Abu Dawud (1203) and Nasai (665) both narrated it through the route of Ibn Wahb, from Amr bin Harith, that Abu Ashana Maafiri told him, from Uqba bin Amir, and he mentioned it. Ibn Hibban (1660) graded it sahih, and reported it through this same route. Imam Ahmad (17443) also reported it through two routes, one of which is this route, and the other through Ibn Lahia, who said, Abu Ashana told us (17312, 17442). There is some discussion regarding Ibn Lahia, but he was corroborated in the first chain.