It is narrated from Hazrat Abu Umamah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) passed by a man who was reciting Surah Ikhlas. The Noble Prophet (peace and blessings be upon him) said, "Paradise has become obligatory for him."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22289
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف جدا، من أجل على بن يزيد