Abu Musa al-Ashari
Why he matters
A prominent companion appointed as governor of Basra, where he taught the Quran extensively. The Prophet famously praised his beautiful recitation, comparing it to the Psalms of David.
Sahih al-Bukhari 4341
عَنْ أَبِي بُرْدَةَ، عَنْ أَبِيهِ، قَالَ بَعَثَ رَسُولُ اللَّهِ صلى الله عليه وسلم أَبَا مُوسَى وَمُعَاذَ بْنَ جَبَلٍ إِلَى الْيَمَنِ، قَالَ وَبَعَثَ كُلَّ وَاحِدٍ مِنْهُمَا عَلَى مِخْلاَفٍ، قَالَ وَالْيَمَنُ مِخْلاَفَانِ، ثُمَّ قَالَ " يَسِّرَا وَلاَ تُعَسِّرَا، وَبَشِّرَا وَلاَ تُنَفِّرَا ".
Narrated Abu Burda: The Prophet (ﷺ) sent Abu Musa and Mu`adh to Yemen and said to both of them, "Facilitate things for the people (treat the people in the most agreeable way), and do not make things difficult for them, and give them glad tidings, and let them not have aversion (i.e. to make the people hate good deeds) and you should both work in cooperation and mutual understanding, obey each other."
Sahih al-Bukhari 5048
عَنْ أَبِي مُوسَى، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ لَهُ " يَا أَبَا مُوسَى لَقَدْ أُوتِيتَ مِزْمَارًا مِنْ مَزَامِيرِ آلِ دَاوُدَ ".
Narrated Abu Musa: That the Prophet (ﷺ) said to him, "O Abu Musa! You have been given one of the musical wind-instruments of the family of David!"