15 As it is said, "HAYOM IM BEKOLO TISHMAU AL TAKSHU LEVAVCHEM ("Today, if you hear his voice, do not harden your heart" TEHILLIM 95:7) as in the Meribah Mered (Rebellion) [the Ma’al shmad Defection, the Azivah Desertion, see 2Th 2:3].