Then the Spirit came on Amasai, who was chief of the thirty, [and he said], "We are yours, David, and on your side, you son of Jesse: peace, peace be to you, and peace be to your helpers; for your God helps you." Then David received them, and made them captains of the band.
That says a lot of a person. One of the weaknesses is a person who is doubleminded or a person who has double allegiance. These men were not of double heart that came from Zebulun, fifty thousand of them.