Quoting%20commentary for Nedarim 4:6

הַמֻּדָּר הֲנָאָה מֵחֲבֵרוֹ, לֹא יַשְׁאִילֶנּוּ וְלֹא יִשְׁאַל מִמֶּנּוּ, לֹא יַלְוֶנּוּ וְלֹא יִלְוֶה מִמֶּנּוּ, וְלֹא יִמְכֹּר לוֹ וְלֹא יִקַּח מִמֶּנּוּ. אָמַר לוֹ, הַשְׁאִילֵנִי פָרָתֶךָ. אָמַר לוֹ, אֵינָהּ פְּנוּיָה. אָמַר קוֹנָם שָׂדִי שֶׁאֲנִי חוֹרֵשׁ בָּהּ לְעוֹלָם, אִם הָיָה דַרְכּוֹ לַחֲרֹשׁ, הוּא אָסוּר וְכָל אָדָם מֻתָּרִין. אִם אֵין דַּרְכּוֹ לַחֲרֹשׁ, הוּא וְכָל אָדָם אֲסוּרִין:

If one bevows benefit from his neighbor, he may not lend him (objects) and he may not borrow from him; he may not lend him (money) and he may not borrow from him. [("He may not lend him (objects)": a decree lest he borrow from him after having bevowed benefitting from him. Likewise, he may not lend (money) to him, a decree lest he borrow from him.] He may not sell to him and he may not buy from him. [He may not sell to him below cost, a decree lest he buy from him below cost and thereby benefit from him.] If a man said (to his neighbor): "Lend me your bullock," and the other said: "It is not free now," and the first: "Konam, if I ever plow my field with it (your bullock)!" If it were his practice to plow it, he is forbidden (to use the) bullock, and all others permitted. (For he intended only that he not plow it, as was his wont, but others may do so.)] If it were not his practice to plow it, he and all others are forbidden. [His intent was that neither he nor others plow it.]

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