Reference for Bava Metzia 125:7

מיתיבי כולם אם יש לו מותר אמר רב הונא אמר רב בשמשך אי בשמשך צריכא למימר אלא כגון שיחד לו קרן זוית

For it was stated: Rab said: One may buy on trust against [future delivery of] crops, but not against [repayment of] money at [future prices].<span class="x" onmousemove="('comment',' I.e., a man may buy crops at present prices, paying immediately, for delivery at some future date, even though they may have appreciated in the meanwhile. But he may not arrange to receive the future value of the crops, for since he may thus receive in actual money more than he gave, it has the appearance of usury. ');">⁷</span>

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