Histories

As for their manner of swearing and divination, they lay their hands on the graves of the men reputed to have been the most just and good among them, and by these men they swear; their practice of divination is to go to the tombs of their ancestors, where after making prayers they lie down to sleep, and take for oracles whatever dreams come to them.

They give and receive pledges by each drinking from the hand of the other party; and if they have nothing liquid, they take the dust of the earth and lick it up.