Reference for Shevuot 49:5

<big><strong>מתני׳</strong></big> אחד דברים של עצמו ואחד דברים של אחרים ואחד דברים שיש בהן ממש ואחד דברים שאין בהן ממש

HOW SO? [IF] HE SAID, T SWEAR THAT I SHALL GIVE TO SO-AND-SO,' OR, I shall not GIVE.' What is meant by, T shall give'? Shall we say, charity to the poor? [For that] he already stands adjured from Mount Sinai, for it is said: Thou shalt surely give him. - It must therefore mean a gift to a rich man.

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