The Ruling on Striking the Face

The Shaykh : And if he has the right to strike her because the cause is present, he must not strike the face.
Likewise, one does not strike anyone else on the face. If your son makes a mistake, do not strike him on the face, because the face is the most noble part of a person and the front of the entire body. If you strike it, it is more humiliating for a person than if you struck anywhere else on his body. That is, strike a man on his shoulder, his upper arm, or his back; he does not feel humiliated as he would if you struck him on the face. For this reason, striking the face and disparaging the face are prohibited.
His saying: means: do not say, "You are ugly," or "May Allah disfigure your face." The prohibition of disparagement includes the prohibition of both physical and moral disparagement. One should not disparage her, for example, by saying, "You are from a bad tribe," "What are you?" "You are not of any family," or the like. All of this is disparagement, which Allah has prohibited.
He said: means: if the cause for boycotting exists, do not boycott her publicly and show people that you are boycotting her. Rather, boycott her in the house, because you may boycott her today and reconcile with her tomorrow, so that your situation remains private. But if your situation becomes public and you say, "By Allah, I am angry at my wife, so I have boycotted her for two or three days, or a month," that would be a mistake. Boycott her in the house, and let no one know of your boycott, until you reconcile with her and everything is back to normal, without anyone from the people knowing about it.