Related for Shevuot 7:5

וְהַחֶנְוָנִי עַל פִּנְקָסוֹ כֵּיצַד, לֹא שֶׁיֹּאמַר לוֹ כָּתוּב עַל פִּנְקָסִי שֶׁאַתָּה חַיָּב לִי מָאתַיִם זוּז, אֶלָּא אָמַר לוֹ תֵּן לִבְנִי סָאתַיִם חִטִּין, תֵּן לְפוֹעֲלִי בְּסֶלַע מָעוֹת, הוּא אוֹמֵר נָתַתִּי וְהֵן אוֹמְרִים לֹא נָטַלְנוּ, (שְׁנֵיהֶן נִשְׁבָּעִים), הוּא נִשְׁבָּע וְנוֹטֵל וְהֵן נִשְׁבָּעִין וְנוֹטְלִין. אָמַר בֶּן נַנָּס, כֵּיצַד אֵלּוּ בָאִין לִידֵי שְׁבוּעַת שָׁוְא וְאֵלּוּ בָאִין לִידֵי שְׁבוּעַת שָׁוְא, אֶלָּא הוּא נוֹטֵל שֶׁלֹּא בִשְׁבוּעָה וְהֵן נוֹטְלִין שֶׁלֹּא בִשְׁבוּעָה:

And a shopkeeper over his ledger — how so? Not that he says to him: "Write in my ledger that you owe me a hundred zuz," but (we are speaking of an instance in which) he said to him (the shopkeeper): "Give my son two sa'ah of wheat," or "Give my workers change of a sela." He says: "I gave," and they say: "We did not receive," he swears and takes, and they swear and take (from the employer). [For the shopkeeper says to him: "I do not trust the workers to take an oath. You trusted them for you did not tell me to give it to them in the presence of witnesses." And the workers, likewise, say to the shopkeeper: "We do not trust you to swear." And when they both swear and take from the employer, they swear before each other, so that either the shopkeeper (will be deterred) by shame before the workers, or the workers before the shopkeeper.] Ben Naness said: How can this be done? These will utter a vain oath or those will utter a vain oath! [For, perforce, one will swear falsely, and the Name of Heaven will be desecrated.] Rather, he takes without an oath and they take without an oath. [The halachah is not in accordance with Ben Naness.]

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