Ibn Ezra on Genesis 21:23/אבן עזרא על בראשית כ״א:כ״ג

1THAT THOU WILT NOT DEAL FALSELY WITH ME. Tishkor (thou wilt deal falsely) is a kal. This is the only place in the Bible that this word appears in the kal.

2MY SON’S SON. Nechdi is to be rendered the son of my son.