1 Samuel 20:3-7

Yet David vowed again, saying, “Your father is well aware that I have found favor in your sight, and he has said, ‘Jonathan is not to know this, otherwise he will be worried.’ But indeed as the Lord lives and as your soul lives, there is just a step between me and death.”

Then Jonathan said to David, “Whatever you say, I will do for you.”

So David said to Jonathan, “Behold, tomorrow is the new moon, and I am obligated to sit down to eat with the king. But let me go so that I may hide myself in the field until the third evening.

If your father misses me at all, then say, ‘David earnestly requested leave of me to run to Bethlehem, his city, because it is the yearly sacrifice there for the whole family.’

If he says, ‘That is good,’ your servant will be safe; but if he is very angry, be aware that he has decided on evil.