15وَلَقَد كانوا عاهَدُوا اللَّهَ مِن قَبلُ لا يُوَلّونَ الأَدبارَ ۚ وَكانَ عَهدُ اللَّهِ مَسئولًاShabbir AhmedAlthough before that they had pledged to Allah that they would not turn their backs (to Faith and against invasion). A pledge to Allah must be answered for.