Exodus 30:20
"When they go into the tabernacle of the congregation, they shall wash with water, that they die not; or when they come near to the altar to minister, to burn offering made by fire unto the LORD:"
Cross References (ranked by relevance)
And Ananias hearing these words fell down, and gave up the ghost: and great fear came on all them that heard these things.
And he smote the men of Bethshemesh, because they had looked into the ark of the LORD, even he smote of the people fifty thousand and threescore and ten men: and the people lamented, because the LORD had smitten many of the people with a great slaughter.
Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
God is greatly to be feared in the assembly of the saints, and to be had in reverence of all them that are about him.
And the anger of the LORD was kindled against Uzza, and he smote him, because he put his hand to the ark: and there he died before God.
Then fell she down straightway at his feet, and yielded up the ghost: and the young men came in, and found her dead, and, carrying her forth, buried her by her husband.