Mishkat al-Masabih 2110
‘Uqba b. ‘Āmir said:
When we were in the Suffa (A kind of verandah at the mosque in Medina where certain poor people lived) God’s mes­senger came out and asked, “Which of you would like to go out every morning to Buthān or al-‘Aqīq (Two wādis not far from Medina where camels were sold) and bring two large-humped she-camels without being guilty of sin or severing ties of relationship?” We replied, “Messenger of God, we would all like that.” He said, “Does not one of you go out in the morning to the mosque and teach or recite two verses of God’s Book? That is better for him than two she- camels, and three verses are better for him than three she-camels, and four verses are better for him than four she-camels, and so on than their numbers in camels.” 

Muslim transmitted it.
وَعَنْ عُقْبَةَ بْنِ عَامِرٍ قَالَ: خَرَجَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَنَحْنُ فِي الصُّفَّةِ فَقَالَ: «أَيُّكُمْ يُحِبُّ أَنْ يَغْدُوَ كُلَّ يَوْم إِلَى بطحان أَو إِلَى العقيق فَيَأْتِي مِنْهُ بِنَاقَتَيْنِ كَوْمَاوَيْنِ فِي غَيْرِ إِثْمٍ وَلَا قَطْعِ رحم» فَقُلْنَا يَا رَسُول الله نُحِبُّ ذَلِكَ قَالَ: «أَفَلَا يَغْدُو أَحَدُكُمْ إِلَى الْمَسْجِدِ فَيَعْلَمُ أَوْ يَقْرَأُ آيَتَيْنِ مِنْ كِتَابِ الله عز وَجل خير لَهُ من نَاقَة أَو نَاقَتَيْنِ وَثَلَاثٍ خَيْرٌ لَهُ مِنْ ثَلَاثٍ وَأَرْبَعٍ خَيْرٌ لَهُ مِنْ أَرْبَعٍ وَمِنْ أَعْدَادِهِنَّ مِنَ الْإِبِل» . رَوَاهُ مُسلم