Said Reish Lakish: Converts are more beloved to G‑d than the Jews who stood at Mt Sinai. The reason is that those who stood at Mt. Sinai may not have accepted the Torah if it hadn’t been for the awesome spectacle of the thunder, lightning, the great wind and the sound of shofars. In contrast, the converts saw none of this and still came to cling to G‑d and accepted the Torah. Could any be dearer than these? (Midrash Tanchuma, Lech Lecha)
“I appeared to Abraham, to Isaac, and to Jacob…” (Exodus 6:3). This seems to be a very straightforward and unambiguous statement by God to Moses.