מֹ֣נֵֽעַ בָּ֭ר יִקְּבֻ֣הוּ לְא֑וֹם וּ֝בְרָכָ֗ה לְרֹ֣אשׁ מַשְׁבִּֽיר׃
He that withholdeth corn, the people shall curse him; But blessing shall be upon the head of him that selleth it.
Rashi on Proverbs
He who keeps back grain [who refrains] from teaching Torah.