Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "Recite the Qur'an correctly! For whoever recites the Qur'an and recites it correctly will receive ten good deeds for every letter, it will become an expiation for ten of his sins, and ten of his ranks will be raised."
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, Nahshal, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التفسير / 11655