Al-Mujadila 58:10

Innama annajwa mina ashshaytaniliyahzuna allatheena amanoo walaysa bidarrihimshay-an illa bi-ithni Allahi waAAalaAllahi falyatawakkali almu/minoon

Private conversation is only from Satan that he may grieve those who have believed, but he will not harm them at all except by permission of Allāh. And upon Allāh let the believers rely.

Whispering (for sinful acts) comes from the ShaiTān (Satan), so that he may grieve those who believe, while it is not harmful to them in the least, except with Allah’s permission. And in Allah the believers must place their trust.