Halakhah do Królów II 2:3

That is that He commanded us to study Torah and to teach it. And that is His saying, "And you shall teach them to your sons" (Deuteronomy 6:4). And it is written in the Sifrei (Sifrei Devarim 34:4), "'To your sons' - these are the students. For students are called, sons, as it is stated, (II Kings 2:3) 'And the sons of the prophets came forth.'" And there (Sifrei Devarim 34:1), it says, "'And you shall teach (shinantam, which is related here to the word, shen, tooth) them' - they shall be sharp in your mouth, so that if one questions you about something, you will not stammer to him, but tell him forthwith." And this command was already repeated several times - "and you shall teach them (and) [to] do them" (Deuteronomy 5:1); "in order that they shall learn" (Deuteronomy 31:12). And the command and the encouragement of this commandment has already been scattered throughout many places in the Talmud. And women are not obligated in it, from His saying, "And you shall teach them to your sons" (Deuteronomy 11:19) - His saying, "your sons," and not, "your daughters," as it is explained in the Gemara (Kiddushin 30a). (See Parashat Vaetchanan; Mishneh Torah, Torah Study 1.)

The commandment of Torah study: The positive commandment to study the wisdom of the Torah and to teach it; meaning to say how we should perform the commandments, guard ourselves from that which God prevented us and to also know the laws of the Torah according to their true intention. And about all of this is it stated (Deuteronomy 6:7), "You shall teach them to you sons." And our Rabbis, may their memory be blessed, said (Sifrei Devarim 34:4), "'Your sons' - these are your students. And thus do you find that students are called sons, as it is stated (II Kings 2:3), 'And the sons of the prophets went out.'" And it is [also] said there (Sifrei Devarim 34:1), "'And you shall teach them (shinantam, which sounds like the word for tooth, hence, make them sharp like a tooth)' - they shall be ordered in your mouth, so that if a person questions you [concerning them], you will not stammer to him, but answer him forthwith." And this commandment is repeated in many places, as it is stated (Deuteronomy 5:1), "and study them and do them," "and in order that you will study them" (Deuteronomy 31:12), "and you shall teach them to your children" (Deuteronomy 11:19).