Reference for Numbers 26:61

וַיָּ֥מָת נָדָ֖ב וַאֲבִיה֑וּא בְּהַקְרִיבָ֥ם אֵשׁ־זָרָ֖ה לִפְנֵ֥י יְהוָֽה׃

And Nadab and Abihu died, when they offered strange fire before the LORD.