intention and sincerity (niyyah)

وَلَا تَكُونُوا۟ كَٱلَّذِينَ خَرَجُوا۟ مِن دِيَـٰرِهِم بَطَرًا وَرِئَآءَ ٱلنَّاسِ وَيَصُدُّونَ عَن سَبِيلِ ٱللَّهِ ۚ وَٱللَّهُ بِمَا يَعْمَلُونَ مُحِيطٌ

And do not be like those who came forth from their homes insolently and to be seen by people and avert [them] from the way of Allāh. And Allāh is encompassing of what they do.

۞ إِنَّمَا ٱلسَّبِيلُ عَلَى ٱلَّذِينَ يَسْتَـْٔذِنُونَكَ وَهُمْ أَغْنِيَآءُ ۚ رَضُوا۟ بِأَن يَكُونُوا۟ مَعَ ٱلْخَوَالِفِ وَطَبَعَ ٱللَّهُ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَعْلَمُونَ

The cause [for blame] is only upon those who ask permission of you while they are rich. They are satisfied to be with those who stay behind, and Allāh has sealed over their hearts, so they do not know.

لَا تَقُمْ فِيهِ أَبَدًا ۚ لَّمَسْجِدٌ أُسِّسَ عَلَى ٱلتَّقْوَىٰ مِنْ أَوَّلِ يَوْمٍ أَحَقُّ أَن تَقُومَ فِيهِ ۚ فِيهِ رِجَالٌ يُحِبُّونَ أَن يَتَطَهَّرُوا۟ ۚ وَٱللَّهُ يُحِبُّ ٱلْمُطَّهِّرِينَ

Do not stand [for prayer] within it - ever. A mosque founded on righteousness from the first day is more worthy for you to stand in. Within it are men who love to purify themselves; and Allāh loves those who purify themselves.