Cross reference
1 Samuel 20:18
18 Then Jonathan said to him, Tomorrow is the new moon: and you will be missed, because your seat will be empty.
1 Samuel 20:5
5 David said to Jonathan, Behold, tomorrow is the new moon, and I should not fail to sit with the king at meat: but let me go, that I may hide myself in the field to the third day at evening.
1 Samuel 20:25
25 The king sat on his seat, as at other times, even on the seat by the wall; and Jonathan stood up, and Abner sat by Saul's side: but David's place was empty.