The ruling on a man looking at a woman in buying and selling

Question:
Is it permissible for a man to look at a woman in buying and selling?

Answer:
No, he must lower his gaze; he does not look, except if it is a slave girl he intends to buy. If it is a female slave he intends to buy, there is no harm in looking at what he needs. As for buying and selling, no; she must cover herself, and he must lower his gaze.
As for looking in gatherings, such as the story of the Abyssinians, or passing through the markets, looking at their needs in the markets or in the mosque, there is no harm; because this is not a look of desire, but a look at the path, or a general look at those standing, or praying, or playing. For this reason, the Prophet (peace and blessings be upon him) approved that she look from the level of his shoulder (peace and blessings be upon him) at their play. And it indicates the permissibility of playing with spears, swords, and rifles, provided there is no danger to anyone; because this falls under the category of training for jihad and preparing for jihad. For this reason, he (peace and blessings be upon him) approved their doing so, even in the mosque.