וְכֶ֥סֶף מִשְׁנֶ֖ה קְח֣וּ בְיֶדְכֶ֑ם וְאֶת־הַכֶּ֜סֶף הַמּוּשָׁ֨ב בְּפִ֤י אַמְתְּחֹֽתֵיכֶם֙ תָּשִׁ֣יבוּ בְיֶדְכֶ֔ם אוּלַ֥י מִשְׁגֶּ֖ה הֽוּא׃
你們手裡要帶加倍的銀子，並把那退還在你們口袋口的銀子親手帶回去；那或許是一時疏忽。
Radak
וכסף משנה, and a second amount of money. The word משנה occurs in the same sense as here in Jeremiah 17,18 ומשנה שברון, “and shatter them with double destruction.” The vowel segol instead of tzeyreh in שני, indicates that the word is not in a construct mode.
Siftei Chakhamim
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קחו בידכם TAKE IN YOUR HAND to buy food: perhaps the market-price has risen (Genesis Rabbah 91:11).
Rashbam
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אולי משגה הוא PERADVENTURE IT WAS AN OVERSIGHT — perhaps the man in charge of the house forgot it inadvertently).