عَنْ أَبِي أُمَامَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ مَرَّ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ بِرَجُلٍ وَهُوَ يَقْرَأُ قُلْ هُوَ اللَّهُ أَحَدٌ [الإخلاص: 1] فَقَالَ أَوْجَبَ هَذَا أَوْ وَجَبَتْ لِهَذَا الْجَنَّةُ
It is narrated from Sayyiduna 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 Al-Ikhlas. The Prophet (peace and blessings be upon him) said: Paradise has become obligatory for him.