Read and reflect on verse 1318 from Surah At-Tawba: Hence, [O Prophet,] if God brings thee again face to face with some of them," and then they ask thy leave to go forth [to war with thee], say: "Never ...
فَإِنْ رَجَعَكَ اللَّهُ إِلَىٰ طَائِفَةٍ مِنْهُمْ فَاسْتَأْذَنُوكَ لِلْخُرُوجِ فَقُلْ لَنْ تَخْرُجُوا مَعِيَ أَبَدًا وَلَنْ تُقَاتِلُوا مَعِيَ عَدُوًّا ۖ إِنَّكُمْ رَضِيتُمْ بِالْقُعُودِ أَوَّلَ مَرَّةٍ فَاقْعُدُوا مَعَ الْخَالِفِينَ
Hence, [O Prophet,] if God brings thee again face to face with some of them," and then they ask thy leave to go forth [to war with thee], say: "Never shall you go forth with me. nor shall you fight an enemy together with me! Behold, you were well-pleased to stay at home on that first occasion: stay at home, then, with, those who [are obliged to] remain behind!"