I Samuel 20:16-18
I Samuel 20:16-18 NKJV
So Jonathan made a covenant with the house of David, saying, “Let the LORD require it at the hand of David’s enemies.” Now Jonathan again caused David to vow, because he loved him; for he loved him as he loved his own soul. Then Jonathan said to David, “Tomorrow is the New Moon; and you will be missed, because your seat will be empty.