The Groups
وَٱلَّذِينَ ٱجْتَنَبُوا۟ ٱلطَّـٰغُوتَ أَن يَعْبُدُوهَا وَأَنَابُوٓا۟ إِلَى ٱللَّهِ لَهُمُ ٱلْبُشْرَىٰ ۚ فَبَشِّرْ عِبَادِ
But those who have avoided Taghut, lest they worship it, and turned back to Allah - for them are good tidings. So give good tidings to My servants
Nearby ayahs help place verse 39:17 in sequence and meaning.
فَٱعْبُدُوا۟ مَا شِئْتُم مِّن دُونِهِۦ ۗ قُلْ إِنَّ ٱلْخَـٰسِرِينَ ٱلَّذِينَ خَسِرُوٓا۟ أَنفُسَهُمْ وَأَهْلِيهِمْ يَوْمَ ٱلْقِيَـٰمَةِ ۗ أَلَا ذَٰلِكَ هُوَ ٱلْخُسْرَانُ ٱلْمُبِينُ
So worship what you will besides Him." Say, "Indeed, the losers are the ones who will lose themselves and their families on the Day of Resurrection. Unquestionably, that is the manifest loss."
لَهُم مِّن فَوْقِهِمْ ظُلَلٌ مِّنَ ٱلنَّارِ وَمِن تَحْتِهِمْ ظُلَلٌ ۚ ذَٰلِكَ يُخَوِّفُ ٱللَّهُ بِهِۦ عِبَادَهُۥ ۚ يَـٰعِبَادِ فَٱتَّقُونِ
They will have canopies of fire above them and below them, canopies. By that Allah threatens His servants. O My servants, then fear Me.
ٱلَّذِينَ يَسْتَمِعُونَ ٱلْقَوْلَ فَيَتَّبِعُونَ أَحْسَنَهُۥٓ ۚ أُو۟لَـٰٓئِكَ ٱلَّذِينَ هَدَىٰهُمُ ٱللَّهُ ۖ وَأُو۟لَـٰٓئِكَ هُمْ أُو۟لُوا۟ ٱلْأَلْبَـٰبِ
Who listen to speech and follow the best of it. Those are the ones Allah has guided, and those are people of understanding.
أَفَمَنْ حَقَّ عَلَيْهِ كَلِمَةُ ٱلْعَذَابِ أَفَأَنتَ تُنقِذُ مَن فِى ٱلنَّارِ
Then, is one who has deserved the decree of punishment [to be guided]? Then, can you save one who is in the Fire?