Sforno on Genesis 4:23/ספורנו על בראשית ד׳:כ״ג

1שמען קולי נשי למך, Lemech called out in grief

2אמרתי, I have to express my mental anguish’

3הרגתי לפצעי, I have caused myself real injury, for the one who has killed my father (ancestor Kayin) has inflicted upon me the child a deep wound, seeing that the killer was my son.