Talmud for Ketubot 9:4

הַמּוֹשִׁיב אֶת אִשְׁתּוֹ חֶנְוָנִית אוֹ שֶׁמִּנָּהּ אַפּוֹטְרוֹפָּא, הֲרֵי זֶה מַשְׁבִּיעָהּ כָּל זְמָן שֶׁיִּרְצֶה. רַבִּי אֱלִיעֶזֶר אוֹמֵר, אֲפִלּוּ עַל פִּלְכָּהּ וְעַל עִסָּתָהּ:

If one sets his wife up as shopkeeper [to buy and sell in the shop], or if he appoints her a caretaker [to look after his money and to trade with it], he can administer an oath to her whenever he wishes, [an oath similar to a Torah oath on a claim of "perhaps" (you misappropriated, etc.), and he may "roll" onto her (another oath) that she did not "cheat" with her spinning or with her dough.] R. Eliezer says: Even for her spinning and for her dough. [Even ab initio, without "rolling," he can make her swear for her spinning and for her dough. The halachah is not in accordance with R. Eliezer.]

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