3:13

Indeed there was a sign (lesson) for you in the two armies which met on the battlefield (of Badr): one was fighting for the cause of Allah and the other had rejected Allah; the believers saw with their own eyes that the unbelievers were twice their number. But the result of the battle proved that Allah strengthens with His own aid whom He pleases. Surely there is a lesson in this for those who have sight.
Meaning:-
The Battle of Badr (Arabic): fought on Tuesday, 13 March 624 CE (17 Ramadan, 2 AH in the Islamic calendar) in the Hejaz region of western Arabia (present-day Saudi Arabia), was a key battle in the early days of Islam and a turning point in Muhammad’s (PBUH) struggle with his opponents among the Quraish in Mecca.