Vayeshev (וישב) Genesis 37:1 – 40:23
An Argument Should Be for the Sake of Heaven
Even Harsh Speech Can Lessen the Possibility of Violence
An Argument Should Be for the Sake of Heaven(p.90)
Rabbi Natan Sternhartz, Likute Halachot, Orach Chayim, "Hilchot Rosh Chodesh" 3:9