Do not go out to meet caravans for trading, do not undercut one another, do not practice najash (fake outbidding), a city dweller should not sell on behalf of a bedouin, and do not leave the udders of camels and sheep unmilked. Whoever buys them after what has been done to them, he has two options after milking them. If he is satisfied with them, he may keep them, and if he is displeased with them, he may returns them along with a sa' of dates [in return for the amount of milk he consumed].