1 Samuel 20:27-29

27The next day after the new moon, David's seat was still empty at the meal. So Saul said to his son Jonathan, ‘Why has Jesse's son not come to the meal? He did not come yesterday or today.’

28Jonathan answered, ‘David asked me very strongly to let him go to Bethlehem.

29He said, “Please let me go. My family is offering a sacrifice to God in the town. My brother told me that I must be there. If you agree as my friend, let me go to visit my brothers.” That is why David has not come to eat this meal with the king.’