While traveling from city to city selling his wares, a peddler approached the city of Tzipori and called out in a loud voice, “Who wants to buy the potion of life? Who wants life?” A crowd gathered around him. Rabbi Yanai heard the commotion and stood by watching. When he heard the man’s offer, he said to him, “I would like to purchase some.” The peddler responded, “It’s not for you and your type.” Rabbi Yanai persisted. Finally the peddler took out a T’hilim and opened it to the pasuk, “Who is the man who wants life? Guard your tongue from evil.”