For the source text click/tap here: Chagigah 7
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The verse states: “All your males shall appear.” Although the verse as written can be read: “Will see [yireh],” it is actually read: “Shall be seen [yera’e].” The baraita derives that just as I, God, come to see you for free, as He has no obligation to bring an offering when He comes to see us in the Temple, so too, you may come to see Me in the Temple for free, i.e., there is no requirement to bring an offering.
The Gemara accepts this objection and therefore proceeds to explain the dispute between Rabbi Yoḥanan and Reish Lakish in a different manner.
Hashem requires no fees for entrance to see Him, since He shows His face with no entrance fees...
We explore the notion of Torah being free and teaching Torah should have no compensation according to the RAMBAM.