Leviticus 9-11: Aaron is Silent

The priest, Aaron and his sons, begin their ministry, but it is preceded by a warning from Moses that carried with it the prospect of death if it was not obeyed.  "And you shall not go outside the door of the tabernacle of meeting for seven days, until the days of your consecration are ended. For seven days he shall consecrate you.  As he has done this day, so the LORD has commanded to do, to make atonement for you. Therefore you shall stay at the door of the tabernacle of meeting day and night for seven days, and keep the charge of the LORD, so that you may not die; for so I have been commanded.”  - Lev. 8:33-35 NKJV

The Lords commands were followed, the priests brought their offering before the Lord, where fire came out and consumed the offering before all of the Israelites.  This display of God's power ignited the people so that they shouted for joy and fell face down.  Everyone seeing this fire from God should have realized that this was serious business.  But not Aaron's Sons, Nadab and Abihu.  Perhaps they were giddy with the celebration, or they just didn't think.  At any rate, they grabbed up the censers, put fire and incense in them and waved the censers around in front of the Lord.  Oops.  The fire of the Lord burned them up, just as it had done to the offering.  God would not tolerate any disrespect. Moses had to remind Aaron of what the Lord said
" 'Among those who approach me
I will show myself holy;
in the sight of all the people
I will be honored.'
Aaron remained silent."- Lev 10:3

Imagine!  Aaron has seen the fire of the Lord consume the sacrifice, and then turn around and consume his sons.  He knows now that God is very serious about all of His commands.  "I am the LORD your God; consecrate yourselves and be holy, because I am holy."  Lev 11:44 NKJV.  It is an awesome thing to come into the presence of the one Holy God. That should be enough to silence anyone.