Markos 12:28-31

And one of the Sofrim approached and heard them debating, and seeing that Rebbe, Melech HaMoshiach answered them well, asked him, Which mitzvah is rishonah of all the mitzvot? Rebbe, Melech HaMoshiach answered, SHEMA YISROEL ADONOI ELOHEINU ADONOI ECHAD is harishonah. VAHAVTA ES ADONOI ELOHEICHA BKHOL LVAVCHA UVECHOL NAFSHECHA UVECHOL MODECHA. And the shneyah is this, VAHAVTA LREACHA KAMOCHA. There is not another mitzvah greater than these.