ואבר מן החי לבני נח – And a limb from a live animal to בני נח
Summary:
A ישראל is forbidden from assisting a נכרי [even for free] to acquire איסה"נ which belong to the נכרי. It is considered as if the ישראל is benefitting from איסוה"נ. The exception is if it is לא אפשר ולא קא מיכוון (or if the נכרי is not aware that he is being assisted).
מנין שלא יצבע –From where do we derive that he should not dye
Summary:
איסור הנאה does not necessarily include איסור צביעה (for it is merely an appearance) or איסור הדלקה (for it is part of the destruction process). The איסור הדלקה is only by oil where the איסור is בעין however by firewood it may be permitted (according to the מ"ד אין שבח עצים בפת).