Reference for Avodah Zarah 71:9

וכי תימא אתא דניאל גזר ולא קיבל ואתו תלמידי דהלל ושמאי וגזור וקיבל א"כ מאי אסהדותיה דרב אלא דניאל גזר עליו בעיר ואתו אינהו וגזור אפילו בשדה

And should you argue that Daniel came and made the decree but it was not accepted, and then the disciples of Hillel and Shammai came and made the decree which was accepted, in that case what was the purpose of Rav’s testimony? Rather, Daniel decreed against the use of the oil in a city, and they came and decreed against its use even in a field.

Jastrow