From the David Wootton translation:
No new ruler, let me point out, has ever disarmed his subjects; on the contrary, when he has found them disarmed, he has always armed them. For, when you arm them, their arms become yours, those who have been hostile to you become loyal, while those who have been loyal remain so, and progress from being your obedient subjects to being your active supporters … But if you take their arms away from those who have been armed, you begin to alienate them. You make it clear you do not trust them, either because you think they are poor soldiers or disloyal. Whichever view they attribute to you, they will begin to hate you.
The Prince, Chapter 20.