Ubiquitin.
“Though it is probably Assur to believe that a Talmud chocham or any frum yid for that matter compromised their beliefs for “parnossa”
It is also Assur to get paid a Parnossa for teaching Torah.
Avot : perek 4 Mishna 5, “and don’t use it as a spade with which to dig”
Rabbenu Ovadaya MBartenura : “And do not study Torah in order to make from it a craft from which to earn a living, like a spade to dig with. As one that does this misappropriates the sanctity of the Torah and is liable for the death penalty from the Heavens, like one who derives benefit from hekdesh. And teachers of small children receive payment for watching the children … ; and payment for breaking up the cantillation …. But payment for teaching is forbidden to take, as it is written, (Devarim 4:14), “And Hashem commanded me at that time to teach you statutes and ordinances, so that you should do them in the land to which you are crossing, to possess” – just like I [was taught] for free, so too are you [to be taught] for free.