Exodus 32:27-28

AKJV_Strongs(i)
  27 H559 And he said H3541 to them, Thus H559 said H3068 the LORD H430 God H3478 of Israel, H7760 Put H376 every man H2719 his sword H3409 by his side, H5674 and go H8179 in and out from gate H8179 to gate H4264 throughout the camp, H2026 and slay H376 every man H251 his brother, H376 and every man H7453 his companion, H376 and every man H7138 his neighbor.
  28 H1121 And the children H3878 of Levi H6213 did H1697 according to the word H4872 of Moses: H5307 and there fell H5971 of the people H3117 that day H7969 about three H505 thousand H376 men.