'Knew' in the Bible

You should tell him that I am about to judge his house forever because of the sin that he knew about. For his sons were cursing God, and he did not rebuke them.

(Now the servant did not understand any of this. Only Jonathan and David knew what was going on.)

Then the king said to the messengers who were stationed beside him, "Turn and kill the priests of the Lord, for they too have sided with David! They knew he was fleeing, but they did not inform me." But the king's servants refused to harm the priests of the Lord.

Then David said to Abiathar, "I knew that day when Doeg the Edomite was there that he would certainly tell Saul! I am guilty of all the deaths in your father's house!