At-Tawbah 9:47

Law kharajoo feekum ma zadookumilla khabalan walaawdaAAoo khilalakumyabghoonakumu alfitnata wafeekum sammaAAoona lahum wallahuAAaleemun biththalimeen

Had they gone forth with you, they would not have increased you except in confusion, and they would have been active among you, seeking [to cause] you fitnah [i.e., chaos and dissension]. And among you are avid listeners to them. And Allāh is Knowing of the wrongdoers.

And had they set out with you, they would have added nothing for you but trouble, and would have run around in your midst seeking mischief against you. Still, among you there are those who spy for them. Allah is aware of the wrongdoers.