Hadithcore
Sahih al-Bukhari, 4951
sahih

Narrated Jundub Al-Bajali:

A lady said, "O Allah's Messenger (ﷺ) ! I see that your friend has delayed. (in conveying Qur'an) to you." So there was revealed: 'Your Lord (O Muhammad) has neither forsaken you, not hated you.' (93:1-3)

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، غُنْدَرٌ حَدَّثَنَا شُعْبَةُ، عَنِ الأَسْوَدِ بْنِ قَيْسٍ، قَالَ سَمِعْتُ جُنْدَبًا الْبَجَلِيَّ، قَالَتِ امْرَأَةٌ يَا رَسُولَ اللَّهِ مَا أُرَى صَاحِبَكَ إِلاَّ أَبْطَأَكَ‏.‏ فَنَزَلَتْ ‏{‏مَا وَدَّعَكَ رَبُّكَ وَمَا قَلَى‏}‏

References2 variants
In-Book Reference
Book 65, Hadith 473
USC-MSA web (English) reference
Vol. 6, Book 60, Hadith 476 (deprecated numbering scheme)