“In the Tent of Meeting, outside the veil which is before the Witness, Aharon and his sons are to tend it from evening until morning before יהוה – a law forever to their generations, from the children of Yisra’ĕ
“And Aharon shall make atonement upon its horns once a year with the blood of the sin offering of atonement – once a year he makes atonement upon it throughout your generations. It is most set-apart to יהוה.”
And יהוה said to Mosheh, “Speak to Aharon your brother not to come in at all times to the Set-apart Place inside the veil, before the lid of atonement which is on the ark, lest he die, because I appear in the cloud above the lid of atonement.
But into the second part the high priest went alone once a year, not without blood, which he offered for himself and for sins of ignorance of the people,