In the victory of Allah . He gives victory to whom He wills, and He is the Exalted in Might, the Merciful.
Tafseer
{ بنصر الله } إياهم على فارس وقد فرحوا بذلك وعلموا به يوم وقوعه أي يوم بدر بنزول جبريل بذلك مع فرحهم بنصرهم على قتل المشركين فيه { ينصر من يشاء وهو العزيز } الغالب { الرحيم } بالمؤمنين }.
{By the victory of God} for them over Persia, and they rejoiced at that and knew about it on the day of its occurrence, that is, the day of Badr, when Gabriel descended with that, along with their rejoicing at their victory over the killing of the polytheists in it. {He gives victory to whom He wills, and He is the Exalted in Might} the Victorious {the Merciful} to the believers.
