TT #774 · Parashas Ki Seitzei · Seventh Aliyah · Passuk 25:14
You shall not have in your house two kinds of measures, a large and a small.
Torah Temimah points to Bava Batra 89a.
TT lemma: בְּבֵיתֶךָ.
בְּבֵיתֶךָ – אָמַר רַב יְהוּדָה מִסּוּרָא: לֹא יִהְיֶה לְךָ בְּבֵיתֶךָ – מַה טַּעַם? מִשּׁוּם אֵיפָה וְאֵיפָה.
English: “In your house” — Rav Yehudah of Sura said: “You shall not have in your house” — why? Because of the (prohibition of) two kinds of ephah.
On the daf / in context: The presence of dishonest measures in the house is itself forbidden, even before they are used.
Derash on the prohibition of possessing dual measures.
It is forbidden even to possess a set of dishonest measures in one’s house.