سورة Al-Imran ( The Famiy of Imran ) - الآية 167

and ascertain the hypocrites. [When] they were told: ‘Come, fight in the way of Allah, or defend [yourselves], they said, ‘If we knew any fighting, we would have surely followed you.’ That day they were nearer to unfaith than to faith. They say with their mouths what is not in their hearts, and Allah knows well whatever they conceal.