Reading the words of "will we do, and hear" Rabbi Simlai taught that when the Israelites gave precedence to "we will do" over "we will hear" (promising to obey God's commands even before hearing them), 600,000 ministering angels came and set two crowns on each Israelite man, one as a reward for "we will do" and the other as a reward for "we will hear." But as soon as the Israelites committed the sin of the Golden Calf, 1.2 million destroying angels descended and removed the crowns, as it is said in "And the children of Israel stripped themselves of their ornaments from mount Horeb."