與你何干 What Is That To You
那駙馬聞言，微微冷笑道：「你原來是取經的和尚，沒要緊羅織管事。我偷他的寶貝，你取佛的經文，與你何干，卻來廝鬥？」那驸马闻言，微微冷笑道：「你原来是取经的和尚，没要紧罗织管事。我偷他的宝贝，你取佛的经文，与你何干，却来厮斗？」
逐句解 Line by line
The son-in-law heard him out and said with a small cold laugh, "So you are the monk who goes for the scriptures — trumping up charges to no purpose and meddling in what is not yours.
沒 is méi, and 沒要緊 means without any need for it. 羅織 is a legal term of art for weaving a case out of nothing, and putting it in the fiend's mouth answers the recitation directly: the deposition just recited is exactly what he is calling fabricated. 那 is deictic, nà.
I stole his treasure; you go to fetch the Buddha's scriptures. What has it to do with you, that you should come brawling here?"
干 holds gān by the invariant ruling, and 與你何干 — what has it to do with you — is the frame that makes the graph so common in this sense. 佛 stands at fó and 的 at de at both sites. The two clauses are laid out as a strict parallel so that the theft and the pilgrimage look like two private errands that happen not to intersect.
The retort is the best argument anyone makes in this passage, and the novel gives it to the thief. He does not deny the theft. He concedes it in the first clause and then asks what standing the other party has: I robbed him, you are going for scriptures, the two have nothing to do with each other. Put that way it is hard to answer, and Pilgrim will need three segments to do it.
羅織 is the sharpest word in the speech. It belongs to the vocabulary of judicial framing — weaving a net of charges around someone — and it accuses the recitation of being manufactured. The recitation had in fact been careful to cite a sworn deposition taken before a throne, which is precisely the kind of document a charge of 羅織 is designed to discredit.
The cold laugh is the only stage direction, and it is doing the same work as the laugh the same character gave his father-in-law a few passages earlier. He is a creature the novel characterises almost entirely through composure.