Midrash su Deuteronomio 6:20

(Exodus 13:14) "And it shall be if your son asks you tomorrow": "tomorrow" may indicate" in the present," and it may indicate "in time to come." (Exodus 17:9) "Tomorrow I will stand on top of the hill" — in the present. (Joshua 22:24) "Tomorrow your children might say to our children" — in time to come. (It is written, Devarim 6:20) "If your son asks you tomorrow (i.e., in the time to come): What are the testimonies and the statutes, etc.": There are four sons: a wise son, a wicked son, a simple son, and one who does not know how to ask. What does the wise son say? "What are the testimonies and the statutes and the judgments that the L-rd our G-d commanded us?" — you, likewise, "open" to him in the halachoth of Pesach — "ein maftirin achar hapesach afikoman." What does the wicked son say? (Exodus 12:26) "What is this (Pesach) service to you?" "to you" and not to him. Because he disassociated himself from the congregation and denied the foundation (of the faith), you, likewise, blunt his teeth and tell him (Ibid. 13;8) "Because of this (the mitzvoth) the L-rd wrought for me when I went out of Egypt." For me and not for you. Had you been there, you would not have been redeemed. What does the simple son say? (Ibid. 14) "What is this?" And you shall tell him (Ibid.) "With might of hand did the L-rd take us out of Egypt from the house of bondage." And he who does not know how to ask, you open for him, as it is written (Ibid. 8) "And you shall tell your son on that day, etc." Variantly: "What are the testimonies and the statutes, etc.": R. Eliezer says: Whence is it derived that if there were a company of sages or of disciples they must occupy themselves with the halachoth of Pesach until midnight? From "What are the testimonies, etc."