You are reading a tafsir for the group of verses 3:156 to 3:158
يا ايها الذين امنوا لا تكونوا كالذين كفروا وقالوا لاخوانهم اذا ضربوا في الارض او كانوا غزى لو كانوا عندنا ما ماتوا وما قتلوا ليجعل الله ذالك حسرة في قلوبهم والله يحيي ويميت والله بما تعملون بصير ١٥٦ ولين قتلتم في سبيل الله او متم لمغفرة من الله ورحمة خير مما يجمعون ١٥٧ ولين متم او قتلتم لالى الله تحشرون ١٥٨
يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ لَا تَكُونُوا۟ كَٱلَّذِينَ كَفَرُوا۟ وَقَالُوا۟ لِإِخْوَٰنِهِمْ إِذَا ضَرَبُوا۟ فِى ٱلْأَرْضِ أَوْ كَانُوا۟ غُزًّۭى لَّوْ كَانُوا۟ عِندَنَا مَا مَاتُوا۟ وَمَا قُتِلُوا۟ لِيَجْعَلَ ٱللَّهُ ذَٰلِكَ حَسْرَةًۭ فِى قُلُوبِهِمْ ۗ وَٱللَّهُ يُحْىِۦ وَيُمِيتُ ۗ وَٱللَّهُ بِمَا تَعْمَلُونَ بَصِيرٌۭ ١٥٦ وَلَئِن قُتِلْتُمْ فِى سَبِيلِ ٱللَّهِ أَوْ مُتُّمْ لَمَغْفِرَةٌۭ مِّنَ ٱللَّهِ وَرَحْمَةٌ خَيْرٌۭ مِّمَّا يَجْمَعُونَ ١٥٧ وَلَئِن مُّتُّمْ أَوْ قُتِلْتُمْ لَإِلَى ٱللَّهِ تُحْشَرُونَ ١٥٨
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3

The saying of the hypocrites in verse 156 here is an extension of what was cited in verse 154 earlier: لَوْ كَانَ لَنَا مِنَ الْأَمْرِ‌ شَيْءٌ مَّا قُتِلْنَا هَاهُنَا :"If we had any say in the matter, we would have not been killed here." Since there were chances that sincere Muslims may be affected by such doubt-creating devices used by hypocrites, Muslims were asked through these verses to remain unconcerned with such sayings and doings and adhere to the belief that the span of life and the time of death are ordained by Allah alone.