The Sahabah (may Allah be pleased with them) used to observe how the Messenger of Allah (blessings and peace of Allah be upon him) lived, in order to learn his Sunnahs, as Allah (may He be glorified and exalted) instructed them to do in His Book: {There has certainly been for you in the Messenger of Allah an excellent pattern} [al-Ahzab 33:21]. In this hadith, ‘Abdullah ibn Zayd ibn ‘Asim (may Allah be pleased with him) narrates that he saw the Messenger of Allah (blessings and peace of Allah be upon him) lying down – that is, sleeping – on his back in the mosque, with one of his legs on top of the other, and ‘Umar ibn al-Khattab and ‘Uthman ibn ‘Affan (may Allah be pleased with them both) also used to lie down in the mosque as the Prophet (blessings and peace of Allah be upon him) had done. It is proven from the Prophet (blessings and peace of Allah be upon him) that it is prohibited to lie down placing one leg on top of the other, as it is narrated in Sahih Muslim that the Prophet (blessings and peace of Allah be upon him) said: “No one of you should lie down, then place one of his legs on top of the other.” This prohibition may be understood in the case of the ‘awrah becoming uncovered, because raising one leg on top of the other means bending one leg so that the knee of that leg is high, whilst the other leg is lifted to rest on the knee of the first leg. Even though it is possible that the ‘awrah may become uncovered in this position, the Prophet (blessings and peace of Allah be upon him) did that in such a way that nothing of it could be seen. It was also said that this prohibition was abrogated by this hadith, and the action of the two caliphs ‘Umar and ‘Uthmaan, who did that after the Prophet (blessings and peace of Allah be upon him), is quoted as evidence for that abrogation, because it is not possible that they were unaware of what of his Sunnah abrogated or was abrogated. This hadith indicates that it is permissible to lie down in the mosque in any position, so long as there is no risk of the ‘awrah becoming uncovered..