(Devarim 11:13) "And it shall be, if hearken you shall hearken to My mitzvoth": Because it is written (Ibid. 5:1) "And you shall learn them (the mitzvoth) and you shall heed them to do them," I might think that there is no obligation for learning until there is an obligation for doing; it is, therefore, written (the redundant) "if hearken (i.e., learn) you shall hearken," Scripture indicating that the obligation for learning is immediate.