Exodus 32:28
"And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men."
Cross References (ranked by relevance)
Deuteronomy 33:9
Who said unto his father and to his mother, I have not seen him; neither did he acknowledge his brethren, nor knew his own children: for they have observed thy word, and kept thy covenant.
Numbers 16:41
But on the morrow all the congregation of the children of Israel murmured against Moses and against Aaron, saying, Ye have killed the people of the LORD.
1 Corinthians 10:8
Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.