1 Chronicles 12:16-17
16-17There were also men from the tribes of Benjamin and Judah who joined David in his wilderness fortress. When David went out to meet them, this is what he said: "If you have come in peace and to help me, you are most welcome to join this company; but if you have come to betray me to my enemies, innocent as I am, the God of our ancestors will see through you and bring judgment on you."
18Just then Amasai chief of the Thirty, moved by God's Spirit, said,
We're on your side, O David,
We're committed, O son of Jesse;
All is well, yes, all is well with you,
And all's well with whoever helps you.
Yes, for your God has helped and does help you.
So David took them on and assigned them a place under the chiefs of the raiders.