What does Leviticus 10:3 mean?

Moses said to Aaron, 'This is what the Lord meant when He said, "I will show My holiness to those who come near Me, and I will be honored in front of all the people."' Aaron stayed silent. Leviticus 10:3 - Modern Text Bible

(Moses explains that God had warned about the seriousness of approaching Him. Aaron is devastated but doesn't argue, accepting God's judgment.)