The Repentance
لَقَدِ ٱبْتَغَوُا۟ ٱلْفِتْنَةَ مِن قَبْلُ وَقَلَّبُوا۟ لَكَ ٱلْأُمُورَ حَتَّىٰ جَآءَ ٱلْحَقُّ وَظَهَرَ أَمْرُ ٱللَّهِ وَهُمْ كَـٰرِهُونَ
They had already desired dissension before and had upset matters for you until the truth came and the ordinance of Allah appeared, while they were averse.
Nearby ayahs help place verse 9:48 in sequence and meaning.
۞ وَلَوْ أَرَادُوا۟ ٱلْخُرُوجَ لَأَعَدُّوا۟ لَهُۥ عُدَّةً وَلَـٰكِن كَرِهَ ٱللَّهُ ٱنۢبِعَاثَهُمْ فَثَبَّطَهُمْ وَقِيلَ ٱقْعُدُوا۟ مَعَ ٱلْقَـٰعِدِينَ
And if they had intended to go forth, they would have prepared for it [some] preparation. But Allah disliked their being sent, so He kept them back, and they were told, "Remain [behind] with those who remain."
لَوْ خَرَجُوا۟ فِيكُم مَّا زَادُوكُمْ إِلَّا خَبَالًا وَلَأَوْضَعُوا۟ خِلَـٰلَكُمْ يَبْغُونَكُمُ ٱلْفِتْنَةَ وَفِيكُمْ سَمَّـٰعُونَ لَهُمْ ۗ وَٱللَّهُ عَلِيمٌۢ بِٱلظَّـٰلِمِينَ
Had they gone forth with you, they would not have increased you except in confusion, and they would have been active among you, seeking [to cause] you fitnah. And among you are avid listeners to them. And Allah is Knowing of the wrongdoers.
وَمِنْهُم مَّن يَقُولُ ٱئْذَن لِّى وَلَا تَفْتِنِّىٓ ۚ أَلَا فِى ٱلْفِتْنَةِ سَقَطُوا۟ ۗ وَإِنَّ جَهَنَّمَ لَمُحِيطَةٌۢ بِٱلْكَـٰفِرِينَ
And among them is he who says, "Permit me [to remain at home] and do not put me to trial." Unquestionably, into trial they have fallen. And indeed, Hell will encompass the disbelievers.
إِن تُصِبْكَ حَسَنَةٌ تَسُؤْهُمْ ۖ وَإِن تُصِبْكَ مُصِيبَةٌ يَقُولُوا۟ قَدْ أَخَذْنَآ أَمْرَنَا مِن قَبْلُ وَيَتَوَلَّوا۟ وَّهُمْ فَرِحُونَ
If good befalls you, it distresses them; but if disaster strikes you, they say, "We took our matter [in hand] before," and turn away while they are rejoicing.