Exodus 32:28-30

New Catholic Bible

²⁸ The sons of Levi did as Moses had commanded them. On that day three thousand men from among the people perished. ²⁹ Moses then said, “Today you have consecrated yourself to the service of the Lord, each one at the cost of his son or his brother, that he might bestow a blessing upon you this day.”

³⁰ Moses Intercedes for His People. The next day Moses said to the people, “You have committed a great sin. Today I will climb up to the Lord. Perhaps I will obtain pardon for your sin.”