Tractate Pirkei Avot - Chapter 6 - Mishnah 2

Rabbi Joshua ben Levi said: every day a bat kol (a heavenly voice) goes forth from Mount Horeb and makes proclamation and says: “Woe unto humankind for their contempt towards the Torah”, for whoever does not occupy himself with the study of Torah is called, nazuf (the rebuked. As it is said, “Like a gold ring in the snout of a pig is a beautiful woman bereft of sense” (Proverbs 11:22). And it says, “And the tablets were the work of God, and the writing was the writing of God, graven upon the tablets” (Exodus 32:16). Read not haruth [‘graven’] but heruth [ ‘freedom’]. For there is no free man but one that occupies himself with the study of the Torah. And whoever regularly occupies himself with the study of the Torah he is surely exalted, as it is said, “And from Mattanah to Nahaliel; and Nahaliel to Bamoth” (Numbers 21:19).