Reference for Bava Kamma 173:4

והשתא דשמעית להא דר' חנינא דאמר ר' חנינא גדול המצווה ועושה ממי שאינו מצווה ועושה מאן דאמר לי אין הלכה כרבי יהודה עבדינא יומא טבא לרבנן מ"ט דכי מפקדינא אית לי אגרא טפי:

I still perform commandments, but now that I have heard the statement of R. Hanina, as R. Hanina indeed said<span class="x" onmousemove="('comment',' V. supra p. 215. ');">⁶</span> that greater is the reward of those who being enjoined do [good deeds] than of those who without being enjoined [but merely of their own free will] do [good deeds], if someone would tell me that the <i>halachah</i> is not in accordance with R. Judah I would make a festive occasion for our Rabbis, because if I am enjoined to perform commandments the reward will be greater for me.

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