Berean Study Bible (BSB) - 1 Samuel 20:18 >

Then Jonathan said to David, “Tomorrow is the New Moon, and you will be missed if your seat is empty.

Jewish Publication Society of America Version (JPS1917) - 1 Samuel 20:18 >

And Jonathan said unto him: 'To-morrow is the new moon; and thou wilt be missed, thy seat will be empty.