Come over here, Antilochus, royal prince –
this is the old custom. Come, stand in front
of your team and chariot, grasp the coiling whip
that lashed them home, lay your hand on their manes
and swear by the mighty god who grips and shakes the earth
you never blocked my chariot – not by deliberate foul.
– Homer
The Iliad, Book 23, lines 645-650. Menelaus calls Antilochus out for unsportsmanlike conduct during the chariot race. He makes Antilochus swear by the god Poseidon that he did not deliberately block his chariot during the race.