Deuteronomy 9:24

To know you. When Moses slew the Egyptian, and would have pacified two of his contending brethren, they refused to receive his mediation; so also, when he returned from Madian, to rescue them from slavery, they presently began to murmur against him, and continued to do so frequently for 40 years. (Haydock) --- Septuagint refers this to God, "from the day that he was known to you," and received you for his peculiar people, Exodus xi. 25.