'Separates' in the Bible

For anyone of the house of Israel or among the strangers who immigrate to Israel who separates himself from Me, taking his idols into his heart, and puts right before his face the [vile] stumbling block of his wickedness and guilt, and [then] comes to the prophet to ask of Me for himself, I the Lord will answer him Myself.

Also I gave them My Sabbaths to be a sign between Me and them, that they might know [without any doubt] that I am the Lord who sanctifies them (separates and sets them apart).