﴿ لَئِنْ أُخْرِجُوا۟ لَا يَخْرُجُونَ مَعَهُمْ وَلَئِن قُوتِلُوا۟ لَا يَنصُرُونَهُمْ وَلَئِن نَّصَرُوهُمْ لَيُوَلُّنَّ ٱلْأَدْبَٰرَ ثُمَّ لَا يُنصَرُونَ ﴾

“[for] if those [to whom they have pledged themselves] are indeed driven away, they will not go forth with them; and if war is waged against them, they will not come to their succour; and even if they [try to] succour them, they will most certainly turn their backs [in flight], and in the end will [themselves] find no succour.”

Please check ayah 59:17 for complete tafsir.