He made four copies of this letter, for fear of accidents, and enclosed them in cases of the hardest ebony. Then, calling to him his four couriers, whom he had destined for this employment (these were the ass, the dog, the raven, and the pigeon), he said to the ass:
"I know with what fidelity you served Balaam, my brother. Serve me as faithfully. There is not a unicorn who equals you in swiftness. Go, my dear friend, and deliver this letter to the person himself to whom it is directed, and return."
The ass answered:
"Sir, as I served Balaam, I will serve you. I will go, and I will return."
The sage put the box of ebony into her mouth, and she swiftly departed. He then called Tobit's dog.
"Faithful dog," said Mambres, "more speedy in thy course than the nimble-footed Achilles, I know what you performed for Tobit, son of Tobit, when you and the angel Raphael accompanied him from Nineveh to Ragusa, in Media, and from Ragusa to Nineveh, and that he brought back to his father ten talents, which the slave Tobit, the father, had lent to the slave Gabelus; for the slaves at that time were very rich. Carry this letter as it is directed. It is much more valuable than ten talents of silver."
The dog then replied:
"Sir, if I formerly followed the messenger Ra-
