يَحْلِفُونَ بِٱللَّهِ مَا قَالُوا۟ وَلَقَدْ قَالُوا۟ كَلِمَةَ ٱلْكُفْرِ وَكَفَرُوا۟ بَعْدَ إِسْلَٰمِهِمْ وَهَمُّوا۟ بِمَا لَمْ يَنَالُوا۟ ۚ وَمَا نَقَمُوٓا۟ إِلَّآ أَنْ أَغْنَىٰهُمُ ٱللَّهُ وَرَسُولُهُۥ مِن فَضْلِهِۦ ۚ فَإِن يَتُوبُوا۟ يَكُ خَيْرًا لَّهُمْ ۖ وَإِن يَتَوَلَّوْا۟ يُعَذِّبْهُمُ ٱللَّهُ عَذَابًا أَلِيمًا فِى ٱلدُّنْيَا وَٱلْءَاخِرَةِ ۚ وَمَا لَهُمْ فِى ٱلْأَرْضِ مِن وَلِىٍّ وَلَا نَصِيرٍ
Commentary:
The words, They swear by Allah that they said nothing, also show that the preceding verse refers not to disbelievers and hypocrites jointly, but only to hypocrites. As the verse points out, some of the disbelievers who later turned hypocrites were not insincere in the beginning; but as time went on and Islam made progress, they gradually drifted into disbelief and hypocrisy. For instance, ‘Abdullah bin Ubayy, who afterwards became leader of the hypocrites, was at first a believer. But when he found that by giving his allegiance to the Holy Prophet his own prestige and importance had declined, he turned hostile and began to plot against Islam.
The expression, because Allah and His Messenger had enriched them out of His bounty, means that with the advent of the Holy Prophet to Medina, the prosperity of the town very much increased, its trade thrived and its inhabitants grew rich.
With the arrival of the Holy Prophet in Medina, prosperity of the town very much increased, its trade throve and its inhabitants grew rich.