נוֹתֵ֣ן לָ֭רָשׁ אֵ֣ין מַחְס֑וֹר וּמַעְלִ֥ים עֵ֝ינָ֗יו רַב־מְאֵרֽוֹת׃
El que da al pobre, no tendrá pobreza: Mas el que aparta sus ojos, tendrá muchas maldiciones.
Rashi on Proverbs
will suffer no want (to give him much charity.) And so it is with the teacher who does not withhold Torah from his pupil.