The Repentance
أَمْ حَسِبْتُمْ أَن تُتْرَكُوا۟ وَلَمَّا يَعْلَمِ ٱللَّهُ ٱلَّذِينَ جَـٰهَدُوا۟ مِنكُمْ وَلَمْ يَتَّخِذُوا۟ مِن دُونِ ٱللَّهِ وَلَا رَسُولِهِۦ وَلَا ٱلْمُؤْمِنِينَ وَلِيجَةً ۚ وَٱللَّهُ خَبِيرٌۢ بِمَا تَعْمَلُونَ
Do you think that you will be left [as you are] while Allah has not yet made evident those among you who strive [for His cause] and do not take other than Allah, His Messenger and the believers as intimates? And Allah is Acquainted with what you do.
Nearby ayahs help place verse 9:16 in sequence and meaning.
قَـٰتِلُوهُمْ يُعَذِّبْهُمُ ٱللَّهُ بِأَيْدِيكُمْ وَيُخْزِهِمْ وَيَنصُرْكُمْ عَلَيْهِمْ وَيَشْفِ صُدُورَ قَوْمٍ مُّؤْمِنِينَ
Fight them; Allah will punish them by your hands and will disgrace them and give you victory over them and satisfy the breasts of a believing people
وَيُذْهِبْ غَيْظَ قُلُوبِهِمْ ۗ وَيَتُوبُ ٱللَّهُ عَلَىٰ مَن يَشَآءُ ۗ وَٱللَّهُ عَلِيمٌ حَكِيمٌ
And remove the fury in the believers' hearts. And Allah turns in forgiveness to whom He wills; and Allah is Knowing and Wise.
مَا كَانَ لِلْمُشْرِكِينَ أَن يَعْمُرُوا۟ مَسَـٰجِدَ ٱللَّهِ شَـٰهِدِينَ عَلَىٰٓ أَنفُسِهِم بِٱلْكُفْرِ ۚ أُو۟لَـٰٓئِكَ حَبِطَتْ أَعْمَـٰلُهُمْ وَفِى ٱلنَّارِ هُمْ خَـٰلِدُونَ
It is not for the polytheists to maintain the mosques of Allah [while] witnessing against themselves with disbelief. [For] those, their deeds have become worthless, and in the Fire they will abide eternally.
إِنَّمَا يَعْمُرُ مَسَـٰجِدَ ٱللَّهِ مَنْ ءَامَنَ بِٱللَّهِ وَٱلْيَوْمِ ٱلْـَٔاخِرِ وَأَقَامَ ٱلصَّلَوٰةَ وَءَاتَى ٱلزَّكَوٰةَ وَلَمْ يَخْشَ إِلَّا ٱللَّهَ ۖ فَعَسَىٰٓ أُو۟لَـٰٓئِكَ أَن يَكُونُوا۟ مِنَ ٱلْمُهْتَدِينَ
The mosques of Allah are only to be maintained by those who believe in Allah and the Last Day and establish prayer and give zakah and do not fear except Allah, for it is expected that those will be of the [rightly] guided.