عن أنس بن مالك رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم لأُبَي بنِ كعْب رضي الله عنه : «إن الله عز وجل أمَرَني أن أَقْرَأَ عَلَيك: (لم يكن الذين كفروا...) قال: وسمَّاني؟ قال: «نعم» فبكى أُبي. وفي رواية: فَجَعَل أُبَي يَبكِي.
In this Hadīth, the Prophet (may Allah's peace and blessings be upon him) informs Ubay ibn Ka‘b that Allah ordered him to recite Sūrat al-Bayyinah to Ubay, so Ubay (may Allah be pleased with him) was amazed at how that could happen when the norm is that the less superior person reads to the one who is more superior, not vice versa.
So when Ubay ascertained the matter from the Prophet (may Allah's peace and blessings be upon him) and received confirmation that Allah has mentioned his name, it made him cry out of joy and happiness that Allah, the Exalted, mentioned him by name.
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