﴿ وَلَقَدْ نَصَرَكُمُ ٱللَّهُ بِبَدْرٍۢ وَأَنتُمْ أَذِلَّةٌۭ ۖ فَٱتَّقُوا۟ ٱللَّهَ لَعَلَّكُمْ تَشْكُرُونَ ﴾

“for, indeed, God did succour you at Badr, when you were utterly weak. Remain, then, conscious of God, so that you might have cause to be grateful.”

(Allah had already given you the victory at Badr) on the day of the Battle of Badr, (when ye were contemptible) few in number: 313 men. (So observe your duty to Allah) fear Allah regarding the matter of war and do not disobey the leader who is in charge of you (in order that ye may be thankful) in order that you are thankful for his help and blessing.