Thematic Bible: What is sanctified

Thus the heavens and the earth were finished, and all the host of them. And on the seventh day God ended His work which He had done; and He rested on the seventh day from all His work which He had done. And God blessed (spoke good of) the seventh day, set it apart as His own, and hallowed it, because on it God rested from all His work which He had created and done.

Now do not stiffen your neck [becoming obstinate] like your fathers, but yield to the Lord and come to His sanctuary which He has sanctified and set apart forever, and serve the Lord your God, so that His burning anger will turn away from you. Verse ConceptsSanctuaryStiffnecked People

But the [Holy] Spirit distinctly and expressly declares that in latter times some will turn away from the faith, giving attention to deluding and seducing spirits and doctrines that demons teach, Through the hypocrisy and pretensions of liars whose consciences are seared (cauterized), Who forbid people to marry and [teach them] to abstain from [certain kinds of] foods which God created to be received with thanksgiving by those who believe and have [an increasingly clear] knowledge of the truth. read more.
For everything God has created is good, and nothing is to be thrown away or refused if it is received with thanksgiving. For it is hallowed and consecrated by the Word of God and by prayer.