Philo Judaeus De Virtutibus 77

[77] Then, having prepared all things for his departure, he did not approach the actual termination of his existence until he had shown respect to all the tribes of his nation by harmonious and consistent prayers in their behalf, honouring them all to the number of twelve by the recapitulation of the name of the patriarch of each tribe, all which prayers we must believe will certainly be accomplished, for the man who offered up the prayers was a devout servant of God, and God is merciful, and the persons on whose behalf the supplications were uttered were men of pure and noble birth, classed in the highest rank possible by the supreme leader of the people, the Creator and Father of the universe.