Duhaym (may Allah have mercy on him) said: The hadith of Sayyiduna Abu al-Darda' (may Allah be pleased with him) from the Prophet (peace and blessings be upon him), "Whoever wears a bow (taken) for teaching the Qur'an", has no basis.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الإجارة / 11686