It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Let the most honourable among you give the adhan, and let the one who is most versed in reading (the Qur'an) lead the prayer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1998