Mattityahu (Mat) 22:37, 39, 38, 40

He told him, “‘You are to love ADONAI your God with all your heart and with all your soul and with all your strength.’

And a second is similar to it, ‘You are to love your neighbor as yourself.’

This is the greatest and most important mitzvah.

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