Adam Clarke on Numbers 17:12

Behold, we die, we perish, we all perish - גוענו gavaenu signifies not so much to die simply, as to feel an extreme difficulty of breathing, which, producing suffocation, ends at last in death. See the folly and extravagance of this sinful people. At first, every person might come near to God, for all, they thought, were sufficiently holy, and every way qualified to minister in holy things. Now, no one, in their apprehension, can come near to the tabernacle without being consumed, Num 17:13. In both cases they were wrong; some there were who might approach, others there were who might not. God had put the difference. His decision should have been final with them; but sinners are ever running into extremes.