Reference for Bava Metzia 149:6

והלל אוסר אמר רב נחמן אמר שמואל הלכה כדברי הלל ולית הלכתא כוותיה

HILLEL, HOWEVER, FORBADE [EVEN THIS.] AND THUS HILLEL USED TO SAY: A WOMAN MUST NOT LEND A LOAF TO HER NEIGHBOUR WITHOUT FIRST VALUING IT, LEST WHEAT ADVANCES AND THUS THEY [THE LENDER AND BORROWER] COME TO [TRANSGRESS THE PROHIBITION OF] USURY.

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