Sforno on Exodus 18:4/ספורנו על שמות י״ח:ד׳

1ויצילני מחרב פרעה. At the time Eliezer was born the old king who had wanted to execute Moses had already been dead for a while. This is one of the reasons why the Torah mentioned this death in Exodus 2,23. At that time Moses felt secure from further attempts on his life. Pharaoh’s international police had an exceedingly long reach, just as that of Achav, King of Israel, who had been hunting for the prophet Elijah all over the neighbouring countries of Israel as documented in Kings I 18,10 “is there any kingdom to which the king (Achav) has not sent emissaries to arrange to have to you captured?”