What is the evidence that the one who is to be flogged does not raise his hand until he sees the whiteness of his armpit?

The Shaykh : They say that if he raises his hand until he sees his armpit, it means the whip is returned to the one being struck with a strong blow. The intention is not to torture him, but rather to discipline him. However, there is a point of consideration here. All their words have been discussed previously, and we have clarified that the correct view is that he is to be flogged in a manner that does not harm him, but serves to discipline him.