2. Ṣalāh (Prayer)

٢۔ كِتَابُ الصَّلَاةِ

2.353 [Machine] The group when they are three.

٢۔٣٥٣ الْجَمَاعَةُ إِذَا كَانُوا ثَلَاثَةً

nasai-kubra:916Qutaybah b. Saʿīd > Abū ʿAwānah > Qatādah > Abū Naḍrah > Abū Saʿīd

When there are three persons, one of them should lead them. The one among them most worthy to act as Imam is one who is best versed in the Qur'an. (Using translation from Muslim 672a)  

الكبرى للنسائي:٩١٦أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ قَتَادَةَ عَنْ أَبِي نَضْرَةَ عَنْ أَبِي سَعِيدٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِذَا كَانُوا ثَلَاثَةً فَلْيَؤُمَّهُمْ أَحَدُهُمْ وَأَحَقُّهُمْ بِالْإِمَامَةِ أَقْرَؤُهُمْ»