Narrated 'ibn Abbas (may Allah be pleased with them):

The verse "And no Prophet could (ever) be false to his trust" was revealed about a red velvet. When it was found missing on the day of Badr, some people said; Perhaps the Messenger of Allah ﷺ has taken it. So Allah, the Exalted, sent down "And no prophet could (ever) be false to his trust" to the end of the verse.

Abu Dawud said: In the word yaghulla the letter ya has a short vowel a.

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ، حَدَّثَنَا خُصَيْفٌ، حَدَّثَنَا مِقْسَمٌ، مَوْلَى ابْنِ عَبَّاسٍ قَالَ قَالَ ابْنُ عَبَّاسٍ رضى الله عنهما نَزَلَتْ هَذِهِ الآيَةُ { وَمَا كَانَ لِنَبِيٍّ أَنْ يَغُلَّ } فِي قَطِيفَةٍ حَمْرَاءَ فُقِدَتْ يَوْمَ بَدْرٍ فَقَالَ بَعْضُ النَّاسِ لَعَلَّ رَسُولَ اللَّهِ ﷺ أَخَذَهَا فَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ { وَمَا كَانَ لِنَبِيٍّ أَنْ يَغُلَّ } إِلَى آخِرِ الآيَةِ . قَالَ أَبُو دَاوُدَ يَغُلَّ مَفْتُوحَةُ الْيَاءِ .