الكافي- ط الاسلامية, volume 5, page 530

3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad and A number of our people have narrated from Ahmad ibn abu ‘Abd Allah all from Muhammad ibn ‘Isa from Yusuf ibn ‘Aqil from Muhammad ibn Qays who has said the following: “Abu Ja‘far (a.s.), has said, ‘Those whom your right hands possess and who have not gained feeling of carnal desires must ask permission from you three times: before the morning Salat (prayer), at noontime when you undress and after Salat (prayer) of al-‘Isha’ which are three times of privacy and thereafter it is not unlawful for you and for them to come and go and move around each other. Those of you who have gained feeling of carnal desire must not enter in the place of your mother, sister, daughter and others without permission and you must not give permission unless he offers you Salam (the phrase of offering greeting of peace) because it is obedience to the Beneficent.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

4. A number of our people have narrated from Ahmad ibn abu ‘Abd Allah from his father from Khalaf ibn Hammad from Rib’iy ibn ‘Abd Allah from al-Fudayl ibn Yasar who has said the following: “About the words of Allah, most Majestic, most Glorious, ‘O believers, those whom your right hands possess and those who have not yet gained feeling of carnal desire must ask permission from you three times’, (24:58) abu ‘Abd Allah (a.s.); and in answer to a question about who such people are has said, ‘They are male and female slaves and the children who are not yet mature. They must ask permission from you during the three hours of privacy; after Salat (prayer) of al-‘Isha’ which is al-‘Atmah, when you undress at noon time and before the morning Salat (prayer). After the three privacy times, your slaves and children can come and go without permission if they wanted.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.