Sayyidah Aishah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) said: "The one skilled in (reciting) the Qur'an will be with the noble angels, and the one who recites the Qur'an stumbling over it, while it is hard for him, will have two rewards."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4055