This is an obligation which the head of the household must undertake, in obedience to the command of Allaah (interpretation of the meaning): “O you who believe! Ward off from yourselves and your families a Fire (Hell) whose fuel is men and stones…” [al-Tahreem 66:6]. This aayah is the basic principle regarding the teaching and upbringing of one’s family, and enjoining them to do what is good and forbidding them to do what is evil. There follow some of the comments of the mufassireen on this aayah, in so far as it pertains to the duties of the head of the household.
Qutaadah said: “He should command them to obey Allaah, and forbid them to disobey Him, and direct them in accordance with the commands of Allaah, and help them to do that.”
Dahhaak and Muqaatil said: “It is the Muslim’s duty to teach his family, including relatives and female slaves, what Allaah has enjoined upon them and what He has forbidden.”
‘Ali (may Allaah be pleased with him) said: “Teach them and discipline them.”
Al-Tabari (may Allaah have mercy on him) said: “We must teach our children and wives the religion and goodness, and whatever they need of good manners. If the Messenger of Allaah (peace and blessings of Allaah be upon him) used to urge the teaching of female servants, who were slaves, what do you think about your children and wives, who are free?”
Al-Bukhaari (may Allaah have mercy on him) said in his Saheeh: “Chapter: a man’s teaching his female slaves and wife.” Then he quoted the hadeeth of the Prophet (peace and blessings of Allaah be upon him): “There are three who will have two rewards: … a man who has a female slave whom he teaches good manners and teaches her well, and teaches her knowledge, and teaches her well, then he frees her and marries her: he will have two rewards.”
Taken from: The Muslim Home – 40 recommendations