Let them be a sign to the Israelites

Numbers 16:19-50
But Moses and Aaron fell facedown and cried out, "O God, the God who gives breath to all living things, will you be angry with the entire assembly when only one man sins?"
The Lord said to Moses, "say to the assembly, 'Move away from the tents of Korah, Darah, Darhan and Abiram."
Moses said, "this is how you will know that the Lord has sent me to do all these things and that it was not my idea: If these men die a natural death and suffer the fate of all mankind, then the Lord has not sent me. But if the Lord brings about something totally new, and the earth opens its mouth and swallows them, with everything that belongs to them, and they go down alive into the realm of the dead, then you will know that these men have gave treated the Lord with contempt.
And fire came out from the Lord and consumed the 250 men who were offering the incense.
For the censers are holy - the censers of the men who sinned at the cost of their lives. Hammer the censers into sheets to overlay the altar, for they were presented before the Lord and have become holy. Let them be a sign to the Israelites.
But 14,700 people died from the plague , in addition to those who had died because of Korah.
God accepts the truth of Moses' and Aaron's plea, sparing the people. Yet the very next day the whole community opposes the leadership and is subject to God's judgment, to be saved once again by Moses and Aaron.
Why?
People's neck is hard and do not listen to the advice and warning of the Lord and Phosphates.
Leadership from the Lord is honor and holy, no one can challenge it or opposes it.
Be aware the Lord is my God, my am the servant of the Lord, listen to the word of God and walk on God's way is blessing and life.
How?
Let them be a sign to the Israelite, God has given me many signs in my life to remember what God have helped me and pour down his grace and mercy on me.