'Separate' in the Bible

And Thou, O Jehovah, Thou hast known me, Thou seest me, and hast tried my heart with Thee, Draw them away as sheep to slaughter, And separate them for a day of slaughter.

Therefore, thus says the Lord [to Jeremiah],“If you repent [and give up this mistaken attitude of despair and self-pity], then I will restore you [to a state of inner peace]So that you may stand before Me [as My obedient representative];And if you separate the precious from the worthless [examining yourself and cleansing your heart from unwarranted doubt concerning My faithfulness],You will become My spokesman.Let the people turn to you [and learn to value My values]—But you, you must not turn to them [with regard for their idolatry and wickedness].

Then Jeremiah went forth out of Jerusalem to go into the land of Benjamin, to separate himself thence in the midst of the people.