The Iliad by Homer Book 4 Page 10

When King Agamemnon saw the blood flowing from the wound he was afraid, and so was brave Menelaus himself till he saw that the barbs of the arrow and the thread that bound the arrow-head to the shaft were still outside the wound. Then he took heart, but Agamemnon heaved a deep sigh as he held Menelaus’s hand in his own, and his comrades made moan in concert. “Dear brother,” he cried, “I have been the death of you in pledging this covenant and letting you come forward as our champion. The Trojans have trampled on their oaths and have wounded you; nevertheless the oath, the blood of lambs, the drink-offerings and the right hands of fellowship in which we have put our trust shall not be vain.

If he that rules Olympus fulfil it not here and now, he will yet fulfil it hereafter, and they shall pay dearly