'Knowledge' in the Bible

It is he who will go as a forerunner before Him in the spirit and power of Elijah, to turn the hearts of the fathers back to the children, and the disobedient to the attitude of the righteous [which is to seek and submit to the will of God]—in order to make ready a people [perfectly] prepared [spiritually and morally] for the Lord.”

To give His people the knowledge of salvationBy the forgiveness of their sins,

So be careful how you listen; for whoever has [a teachable heart], to him more [understanding] will be given; and whoever does not have [a longing for truth], even what he thinks he has will be taken away from him.”

Woe to you lawyers, because you have taken away the key to knowledge (scriptural truth). You yourselves did not enter, and you held back those who were entering [by your flawed interpretation of God’s word and your man-made tradition].”