וְאֵ֖לֶּה מִסְפָּרָ֑ם אֲגַרְטְלֵ֨י זָהָ֜ב שְׁלֹשִׁ֗ים אֲגַרְטְלֵי־כֶ֙סֶף֙ אָ֔לֶף מַחֲלָפִ֖ים תִּשְׁעָ֥ה וְעֶשְׂרִֽים׃ (ס)
And this is the number of them: thirty basins of gold, a thousand basins of silver, nine and twenty knives;
Rashi on Ezra
knives Heb. מַחֲלָפִים. They are knives, and this expression refers to the chamber of the knives (בֵּית הַחֲלִיפוֹת). Because they would deposit the knives therein, it was called the chamber of the depository of the knives (לִשְּׁכַּת בֵּית הַחֲלִיפוֹת).