Muslims claim that Jesus is talking about Muhammad.
7 But very truly I tell you, it is for your good that I am going away. Unless I go away, the Advocate will not come to you; but if I go, I will send him to you.
Why did Lamech believe injury to himself deserved to be avenged, even moreso...
Genesis 4:23 - 24
23 Then Lamech said to his wives: Adah and Zillah, hear my voice; Wives of Lamech, listen to my speech! For I have killed a man for wounding me, Even a young man for hurting me. 24 If Cain shall be avenged sevenfold, Then Lamech seventy-sevenfold.