Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates it from the Messenger of Allah (peace and blessings be upon him) as a marfu' report, that he (peace and blessings be upon him) said: "The best of you is the one who read the Qur'an and taught it (to others)."
No one narrated it from Asim (may Allah have mercy on him) except Sharik (may Allah have mercy on him).
Hadith Referenceالمعجم الأوسط / باب الباء / 3062
Hadith Takhrij«أخرجه الطحاوي فى «شرح مشكل الآثار» برقم: 5127، والطبراني فى «الكبير» برقم: 10325»