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)Allatheena yatarabbasoona bikum fain kana lakum fathun mina Allahi qaloo alam nakun maAAakum wain kana lilkafireena naseebun qaloo alam nastahwith AAalaykum wanamnaAAkum mina almumineena faAllahu yahkumu baynakum yawma alqiyamati walan yajAAala Allahu lilkafireena AAala almumineena sabeelan
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.