Kommentar zu Wajikra 27:25

וכל ערכך יהיה בשקל הקדש Every valuation shall be made according to the holy shekel: i.e., every valuation regarding which shekels are written, will be made according to the holy shekel.

Must be in holy shekolim. Rashi is answering the question: The verse implies that no valuation is less than a shekel, but this is not true since we assess him according to his means and leave him enough to live on, as said earlier (verse 8).

עשרים גרה TWENTY GERAH — twenty meahs. This was what it was originally, but later on they increased it by one sixth. Our Rabbis stated: six silver meahs make a silver denar; thus twenty-four meahs make a selah (a shekel) (cf. Rashi on Exodus 30:13), a shekel being four denars (Bekhorot 26b).

Twenty-four mo’oh to the sela. Because the sela is four dinar, and the dinar is six mo’oh. Thus there are twenty-four mo’oh to the sela.