The 24th prohibition is that we are forbidden from gaining benefit or having in our possession anything from an ir ha'nidachas.1

The source of this commandment is G‑d's statement (exalted be He),2 "Do not allow anything that has been declared taboo to remain in your hands."

Whoever takes3 even the tiniest amount is punished by lashes.

The details of this mitzvah have been explained in the tenth chapter of Sanhedrin.4