永為傳國 A Shrine And Perpetual Incense
特請長老，求些藥引。若得病愈，與長老修建祠堂，四時奉祭，永為傳國之香火。」假唐僧道：「我乃出家人，隻身至此，不知陛下問國丈要甚東西作引？」特请长老，求些药引。若得病愈，与长老修建祠堂，四时奉祭，永为传国之香火。」假唐僧道：「我乃出家人，只身至此，不知陛下问国丈要甚东西作引？」
逐句解 Line by line
We have therefore sent for you, elder, to beg a little of the conducting medicine.
長老 is zhǎng lǎo — 長 here is seniority, not length. It is the standard respectful address to a senior monk, and this translation keeps it as "elder" throughout.
If it should cure the illness, we shall raise a shrine to you, elder, and make offerings at it in all four seasons, so that it becomes an incense fire handed down for as long as the state endures."
The offer is the ordinary Chinese honour for a benefactor: a shrine, seasonal offerings, an unbroken incense fire. 香火, incense fire, is a metaphor for a line of descent that keeps going — it is what a family fears losing when there is no son. So the king is offering, in effect, to make the murdered monk into an ancestor of the kingdom. 為 is wéi here, the copula "to be", not the wèi of the previous passage — same character, opposite job.
The false Tang Monk said, "I am one who has left home, and I have come this far with nothing but my own body. What is it that Your Majesty has asked the Royal Father-in-Law for, to serve as this conductor?"
出家人, "one who has left home," is the ordinary term for a monk, and here it doubles as a plain statement of poverty: he has no goods to give. 甚 is shén, the interrogative "what", not the shèn of "extremely". The question is beautifully placed. Wukong already knows the answer; he is making the king say it out loud in open court.
The bargain on offer is a real one by the standards of the world the novel describes. Shrines were raised to people who saved a town from flood or plague, and the incense would genuinely be kept burning for centuries. The king is not being cynical. He believes he is offering a fair price.
What makes the exchange unbearable is the mismatch of registers. The king speaks the language of state honours; the thing being bought is a man's heart, cut out while he is alive. Wukong's reply keeps the mismatch going by asking a polite procedural question, as though clarifying the terms of a contract.