1 Samuel 20:33
And Saul cast a javelin at him to smite him: whereby Jonathan knew that it was determined of his father to slay David. And Saul cast a javelin at him to smite him: whereby Jonathan knew that it was determined of his father to slay David.
This moment belongs to the time after David killed Goliath, when Saul kept David with him and would not let him return to his father's house, and when Jonathan's soul was knit to David's soul so that he loved him as his own soul. In that love Jonathan made a covenant of brotherhood with David and gave him his robe and his garments, even his sword and his bow and his girdle. The close sacred bond of union between Jonathan's heart and David's was the Lord's doing. It was formed so that Jonathan could be the means of preserving David's life when Saul became determined to kill him.
On the second day of the new-moon feast, Jonathan explained David's absence as going to a family sacrifice at Bethlehem. Saul then in ungovernable anger declared that Jonathan could never come to the throne while David lived and demanded that David be brought to be put to death. When Jonathan interceded by asking why David should be killed and what he had done, Saul in satanic fury hurled at Jonathan the spear he had meant for David, and that violence against his own son proved Saul's fixed determination to slay David. The act convinced Jonathan that his father was determined to kill David, and grieved and indignant he left the feast. He went sorrowing to warn David at the appointed field, where they wept together and parted with a sworn covenant of peace between them and their descendants forever. The union thus established between Jonathan and David remained unbroken until the deaths of Saul and Jonathan.