This is because recitation of the Qur'an is an act of worship and a Qurbah (a good deed by which Allah's Pleasure is sought).
Heestan oo lugu magacaabo “Anoo ku Sugaayo” ayaa hees calool xumo ku dhamaatay waxan ka mida miraha “Anoo ku sugaayo maa saan i yeeshe, ma suurtowda inaa saan igu dhaaftide, su’aasha qiyaama na wada sugeyse”.