3:118O you who believe! Do not befriend outsiders who never cease to wish you harm. They love to see you suffer. Hatred has already appeared from their mouths, but what their hearts conceal is worse. We have made the messages clear for you, if you understand.

3:167And that He may know the hypocrites. And it was said to them, “Come, fight in the cause of God, or contribute.” They said, “If we knew how to fight, we would have followed you.” On that day they were closer to infidelity than they were to faith. They say with their mouths what is not in their hearts; but God knows what they hide.