'Sanctify' in the Bible

"Say to the people, 'Sanctify yourselves against tomorrow, and you will eat flesh; for you have wept in the ears of Yahweh, saying, "Who will give us flesh to eat? For it was well with us in Egypt." Therefore Yahweh will give you flesh, and you will eat.

Yahweh said to Moses and Aaron, "Because you didn't believe in me, to sanctify me in the eyes of the children of Israel, therefore you shall not bring this assembly into the land which I have given them."

because you rebelled against my word in the wilderness of Zin, in the strife of the congregation, to sanctify me at the waters before their eyes." (These are the waters of Meribah of Kadesh in the wilderness of Zin.)