V.1-3 Now David wishes to show kindness to another man. The exact opposite happened in this case. The man refuses the kindness. This is just what happens when a person hears the gospel and decides he won’t accept it.
V.4 Not only does he not accept David’s kindness and suspects David of mischief, but he insults the messengers! The unbeliever never appreciates the grace of God.
V.6-19 Punishment follows. Notice that several join together, but they cannot stand against David’s strength. No one will be able to stand against the Lord when He comes to punish the unbelievers.