ٱلَّذِينَ يَتَرَبَّصُونَ بِكُمْ فَإِن كَانَ لَكُمْ فَتْحٌ مِّنَ ٱللَّهِ قَالُوٓا۟ أَلَمْ نَكُن مَّعَكُمْ وَإِن كَانَ لِلْكَـٰفِرِينَ نَصِيبٌ قَالُوٓا۟ أَلَمْ نَسْتَحْوِذْ عَلَيْكُمْ وَنَمْنَعْكُم مِّنَ ٱلْمُؤْمِنِينَ ۚ فَٱللَّهُ يَحْكُمُ بَيْنَكُمْ يَوْمَ ٱلْقِيَـٰمَةِ ۗ وَلَن يَجْعَلَ ٱللَّهُ لِلْكَـٰفِرِينَ عَلَى ٱلْمُؤْمِنِينَ سَبِيلًا Qur’an An-Nisaa' (4:141)Alla th eena yatarabba s oona bikum fain k a na lakum fat h un mina All a hi q a loo alam nakun maAAakum wain k a na lilk a fireena na s eebun q a loo alam nasta h wi th AAalaykum wanamnaAAkum mina almumineena fa A ll a hu ya h kumu baynakum yawma alqiy a mati walan yajAAala All a hu lilk a fireena AAal a almumineena sabeel a n
Lit., "did we not gain mastery over you [i.e., "over your hearts" - cf. Lane II, 664] and defend you against the believers?" The term "believers" has obviously a sarcastic implication here, which justifies the use of the demonstrative pronoun "those" instead of the definite article "the".
This announcement has, of course, a purely spiritual meaning, and does not necessarily apply to the changing fortunes of life - since (as this very verse points out) "those who deny the truth" may on occasion be "in luck", that is to say, may gain temporal supremacy over the believers.