Book XIV, 72: Oracle given to Rufinus on his enquiring how he should exact an Oath from his own Skipper

When Titan at daybreak mounts above the earth on his path, having dispelled by his rays the injuries of night, and radiant Dawn sheds the light of a new day, then lead the man to the sea-shore and make him stand on the sea-washed beach, looking towards the light of the sun’s rays. Wet him place his right foot in the water and hold it in the surge, while he plants his left on land, and touching with one hand the sea and with the other the dry land, let him swear by Heaven, by the vast Earth, by the harbours of the sea, and by the life-giving Lord of the heavenly fire. For such an oath not even do the gods, the splendid lords of Heaven, dare to dishonour by their mouths.