Zimri (Arabic: السامري) son of Salu was the Prince or leader of a family within the Tribe of Simeon during the time of the Israelites' Exodus in the wilderness at the time when they were approaching the Promised Land. At Abila or Shittim he took part in the Heresy of Peor, taking as a paramour a Midianite woman, Cozbi. Zimri openly defied Moses before the people who were standing at the entrance of the Tabernacle by going in to the Midianite. Phinehas, grandson of Aaron, killed them both by impaling them on a spear (Numbers 25:6-15).
The Israelites subsequently launched an attack on the Midianites.
In Islam, Zimri appears under the name Samiri. Islam assigns to him also a major role in the earlier affair of the Golden Calf, which is not attested in the Bible. The Islamic account attributes to Zimri/Samiri many of the actions which the Bible assigns to Aharon - thus exonerating the latter, Islam's prophet Harun, from involvement in the sinful worship of the Calf.
The modern Phineas Priesthood believe the story of Phinehas and Zimri provides divine mandate for the murder of race traitors; although the previous rebuke of Miriam in Num. 12 for criticising Moses for marrying an Ethiopian woman confounds this reading.