It is narrated from Hazrat Ubayy bin Ka'b (may Allah be pleased with him) that once the Noble Prophet (peace and blessings be upon him) said: Whoever recites Surah Ikhlas, it is as if he has recited one third of the Qur'an.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21275
Hadith Gradingحکم دارالسلام:صحيح لغيره، وقد اختلف فى هذا الإسناد على هلال بن يساف