Leviticus 6:25-26

6:25 “Tell Aaron and his sons, ‘This is the law of the sin offering. In the place where the burnt offering is slaughtered the sin offering must be slaughtered before the Lord. It is most holy. 6:26 The priest who offers it for sin is to eat it. It must be eaten in a holy place, in the court of the Meeting Tent.

tn Heb “holiness of holinesses [or holy of holies] it is.” Cf. NAB “most sacred”; CEV “very sacred”; TEV “very holy.”