"Midrash" is a large group of Jewish "interpretive" stories. Tanchuma, Nitzavim 3 says that when God gave the Torah to the Jews, not only were the people who escaped slavery in Egypt present, but EVERY Jew who will EVER live ALSO was PRESENT--SPIRITUALLY, if not PHYSICALLY.
Tzadik (tsah-DEEK) means "a righteous one"--a Jew who does his or her best to follow God's INSTRUCTION (what the word Torah means) that He gave at Mount Sinai.
SO ... God is in the process of having Jews accept them as their God ...
and some guy's cell phone rings ...