17 Each man is to take his censer and put incense in it—250 censers in all—and present it before the LORD. You and Aaron are to present your censers also.”

Read Numbers 16:17 Using Other Translations

And take every man his censer, and put incense in them, and bring ye before the LORD every man his censer, two hundred and fifty censers; thou also, and Aaron, each of you his censer.
And let every one of you take his censer and put incense on it, and every one of you bring before the LORD his censer, censers; you also, and Aaron, each his censer."
You and each of your 250 followers must prepare an incense burner and put incense on it, so you can all present them before the LORD . Aaron will also bring his incense burner.”