There was an image of an animal, and there is no benefit for us in mentioning what they mentioned about its image, so if that image lulled or a special movement appeared from it, they saw, and their hearts became calm upon seeing that sign of that image, which he called serenity, and the known serenity is located in the hearts, so he did not assign to this nation an external sign. On the authority of them that it has occurred, they have no sign in their hearts other than its occurrence, so it is the proof of itself and does not need evidence from outside, as was the case with the Children of Israel .