Sunan an-Nasai Book 7, Hadith 665

أَخْبَرَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، قَالَ أَنْبَأَنَا عَبْدُ الرَّحْمَنِ، عَنْ شُعْبَةَ، عَنِ الْحَكَمِ، عَنِ ابْنِ أَبِي لَيْلَى، عَنْ عَبْدِ اللَّهِ بْنِ رُبَيِّعَةَ، أَنَّهُ كَانَ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي سَفَرٍ فَسَمِعَ صَوْتَ رَجُلٍ يُؤَذِّنُ فَقَالَ مِثْلَ قَوْلِهِ ثُمَّ قَالَ إِنَّ هَذَا لَرَاعِي غَنَمٍ أَوْ عَازِبٌ عَنْ أَهْلِهِ ‏.‏ فَنَظَرُوا فَإِذَا هُوَ رَاعِي غَنَمٍ ‏.‏

It was narrated from 'Abdullah bin Rubayyi'ah that he was with the Messenger of Allah (S.A.W) on a journey and he heard the voice of a man calling the Adhan, and he said what he said. Then he said:"This is a shepherd or a man who is away from his family." So they looked and so it was a shepherd