The 70th prohibition is that a kohen who has a blemish is forbidden from performing the Temple service.

The source of this prohibition is G‑d's statement,1 "[Speak to Aaron as follows: 'Anyone among your descendants] who has a blemish may not approach.' " This means that he "may not approach" in order to perform the Temple service. Should he perform the service while he has a blemish, he is punished by lashes. This is explicitly stated by the Sifra: "One with a blemish [who serves in the Temple] has violated a Biblical prohibition, but is not punished by death.