"Moses, Moses" (Exodus 3:4), and likewise "Abraham, Abraham," "Jacob, Jacob" (Genesis 46:2), and "Samuel, Samuel" (1 Samuel 3:10): this doubling of the name is a language of affection and a language of urging on.
Why God Called Moses Moses Twice at the Bush
Yalkut Shimoni on Torah 170:1
מֹשֶׁה מֹשֶׁה, "אַבְרָהָם אַבְרָהָם", (שם מו, ב) "יַעֲקֹב יַעֲקֹב", "שְׁמוּאֵל שְׁמוּאֵל", לְשׁוֹן חִבָּה, לְשׁוֹן זֵרוּז.