Narrated by Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) said: Whoever believes in Allah and the Last Day should not be alone with a woman who does not have her mahram present, for the third among them will be the devil.

It is narrated from Sayyiduna ‘Amir bin Rabi‘ah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Beware! No man should ever be alone with a woman who is not lawful for him, because the third one present is the devil, except in the case of a mahram. The devil is with one person and stays away from more than two. And whoever finds evil to be evil and good to be good, then he is a believer.

Narrated from Sayyiduna Umar bin Khattab (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Never should any man be alone with a woman, for the third among them is the devil. And whoever finds goodness pleasing and evil displeasing to him, then he is a believer.

Narrated by Sayyiduna Uqbah bin Amir (may Allah be pleased with him): The Noble Prophet (peace and blessings be upon him) said: Beware especially of entering upon women. An Ansari said: O Messenger of Allah! What is your opinion about the brother-in-law? The Prophet (peace and blessings be upon him) said: The brother-in-law is death.