Matthew 22:34-40

34 but when the P'rushim learned that he had silenced the Tz'dukim, they got together,

35 and one of them who was a Torah expert asked a sh'eilah to trap him:

36 "Rabbi, which of the mitzvot in the Torah is the most important?"

37 He told him, "`You are to love ADONAI your God with all your heart and with all your soul and with all your strength.'

38 This is the greatest and most important mitzvah.

39 And a second is similar to it, `You are to love your neighbor as yourself.'

40 All of the Torah and the Prophets are dependent on these two mitzvot."