Read and reflect on verse 448 from Surah Aal-i-Imraan: Behold, as for those of you who turned away [from their duty] on the day when the two hosts met in battle - Satan caused them to stumble only by means...
إِنَّ الَّذِينَ تَوَلَّوْا مِنْكُمْ يَوْمَ الْتَقَى الْجَمْعَانِ إِنَّمَا اسْتَزَلَّهُمُ الشَّيْطَانُ بِبَعْضِ مَا كَسَبُوا ۖ وَلَقَدْ عَفَا اللَّهُ عَنْهُمْ ۗ إِنَّ اللَّهَ غَفُورٌ حَلِيمٌ
Behold, as for those of you who turned away [from their duty] on the day when the two hosts met in battle - Satan caused them to stumble only by means of something that they [themselves] had done. But now God has effaced this sin of theirs: verily, God is much-forgiving, forbearing.