照數收下 Take In Every Medicine Sent
行者道：「我不攀你，只要你兩個與我收藥。」沙僧道：「收甚麼藥？」行者道：「凡有人送藥來與我，照數收下，待我回來取用。」二人領諾不題。行者道：「我不攀你，只要你两个与我收药。」沙僧道：「收甚么药？」行者道：「凡有人送药来与我，照数收下，待我回来取用。」二人领诺不题。
逐句解 Line by line
Pilgrim said, "I shall not drag you in. I only want you two to take in medicine for me."
收藥 — take in the medicine — is the first mention of the plan that will occupy the rest of the chapter, and it is dropped in as an afterthought on the way out of a door.
Sha Monk said, "Take in what medicine?"
甚 takes shén before 麼. Five characters, and the only thing Sha Monk says in this whole sequence.
Pilgrim said, "Whatever medicines anybody sends me, take them all in by count and keep them till I come back to use them."
照數 — by the reckoning, item for item — is a clerk's phrase, and 數 keeps its full tone shù as a noun.
The two of them assented, and of that we shall say no more.
不題 closes a thread for the third and last time in the chapter. It has now shut the door on a king at his table, on a pig at a wall, and on two disciples left minding a delivery.
The instruction is casual and enormous. He has not examined the patient, has no diagnosis and no prescription, and is arranging in advance to receive every drug in the kingdom — which tells the reader exactly what kind of physician he intends to be.
照數收下 is the giveaway. Not the medicines he needs but all of them, counted in as they arrive, like stock. The plan is already about quantity rather than about diagnosis.