דאשתמש בתגא חלף "One who uses the crown passes away." מכאן אמרו כל הנהנה מדברי תורה נוטל חייו מן העולם "From here they said, 'Anyone who derives benefit from words of Torah, takes his life out of the world.'"

Pirkei Avot chapter 4 mishna 7. see commentary of Rambam who writes that the roshei yeshiva who say it isamitzvah to give money to yeshivot are liars It is a strong sort of language that you do not see usually in the words of the Rambam. But it seems that he saw that Torah was becoming a business and saw this would    bring about a situation lie we see nowadays--when the vast majority of those who claim to be learning and teaching Torah are hypocrites.