Passover Riddles II

From R. Boruch Leff:

I am a Biblical personality. I asked tough questions at a Passover Seder but did not get any answers. Still, my questions lead to good tidings for the Jewish people. Who am I?

In your answer, explain your logic.

The first person to post the correct answer will receive a copy of my book, Forever His Students: Powerful Lessons on Contemporary Jewish Life, based on the insights of Rav Yaakov Weinberg, zt"l (Targum/Feldheim 2004).