Jamieson, Fausset and Brown on Leviticus 24:11

11. And the Israelitish woman's son blasphemed the name of the Lord--A youth of this half-blood, having quarrelled with an Israelite [Le 24:10], vented his rage in some horrid form of impiety. It was a common practice among the Egyptians to curse their idols when disappointed in obtaining the object of their petitions. The Egyptian mind of this youth thought the greatest insult to his opponent was to blaspheme the object of his religious reverence. He spoke disrespectfully of One who sustained the double character of the King as well as the God of the Hebrew people; as the offense was a new one, he was put in ward till the mind of the Lord was ascertained as to his disposal.