Leviticus 10:1-2

Complete Jewish Bible

10 But Nadav and Avihu, sons of Aharon, each took his censer, put fire in it, laid incense on it, and offered unauthorized fire before Adonai, something he had not ordered them to do. ² At this, fire came forth from the presence of Adonai and consumed them, so that they died in the presence of Adonai.