1 Samuel 20:34
So Jonathan arose from the table in fierce anger, and did eat no meat the second day of the month: for he was grieved for David, because his father had done him shame. So Jonathan arose from the table in fierce anger, and did eat no meat the second day of the month: for he was grieved for David, because his father had done him shame.
After David slew Goliath, Saul kept him with him and entrusted him with important responsibilities, yet David preserved his modesty and won the affection of the people and of the royal household. On the second day of the month Jonathan arose from the table in fierce anger and ate no food, grieved and indignant because his father had put shame on David by dishonoring him and seeking to kill him. His sorrow came from his care for David and his recognition that his father's treatment of David was unjust.
His anger and grief sprang from a most sacred covenant brotherhood and bond of union in which his soul and heart were knit with David's soul, loving him as his own soul. That friendship was the Lord's doing, given by God's providence. It was given to preserve the life of Israel's future ruler when Saul would try to kill him, so that Jonathan might be the means of preserving David's life.
The bond remained unbroken until the deaths of Saul and Jonathan. God's providence also connected David with Saul so that by wise behavior David might gain the confidence of the people, and by a long course of hardships and vicissitudes be led to put entire trust in God while being prepared to become ruler of his people.