Surah Aali Imran · 3:165

“"Why [is it that] when a [single] disaster struck you [on the Day of Uhud], although you had struck [the enemy in the Battle of Badr] with one twice as great, you said, 'From where is this?' Say, 'It is from yourselves.' Indeed, Allah is over all things competent" [Quran, 3:165]. — The reference here is Uhud and Badr. And at Badr, there were 140 mushriks killed, so we deduce from this that around 70 Muslims were killed at Uhud.”