Chapter 3, Verse 168

And that He might distinguish the hypocrites. And it was said to them, ‘Come ye, fight in the cause of Allah and repel the attack of the enemy;’ they said, ‘If we knew how to fight, we would surely follow you.’ They were, that day, nearer to disbelief than to belief. They say with their mouths what is not in their hearts. And Allah knows well what they conceal.