All the household of Pharaoh's palace were (helping) to educate (Moses), as it is said, "And it came to pass in those days, when Moses was grown up, that he went out unto his brethren" (Ex. 2:11). Moses went into the camp of Israel, and saw one of the taskmasters of Pharaoh smiting one of the sons of Kohath, the Levites, for they were his brethren, as it is said, "And he saw an Egyptian smiting an Hebrew, one of his brethren" (ibid.). He began to rebuke him with the sword of his lips, and he slew him, and buried him in the midst of the camp, as it is said, "And he smote the Egyptian, and hid him in the sand" (Ex. 2:12). The word Chôl (sand) signifies (here) Israel only, as it is said, "Yet the number of children of Israel shall be as the sand of the sea" (Hos. 1:10).