mu.sa.dah refers to an appointed staff in Isaiah and, in plural construct form, to foundations in Ezekiel.

The attested contexts show an appointed staff in Isaiah 30:32 and, in a building description, foundations in Ezekiel 41:8; the two occurrences are too few to establish a broader range.

1. Appointed staff in a stroke clause · common

   The singular absolute form occurs in the clause about every stroke of the staff that the LORD lays upon him. In Isaiah 30:32 the APB renders this as “the appointed staff” amid tambourines, lyres, and battles.

   Isaiah 30:32
2. Foundations of the sides · common

   The plural construct form occurs in the house description, where the clause measures its height around from the foundations of the sides. In Ezekiel 41:8 the APB renders the relevant phrase with “foundations of the sides.”

   Ezekiel 41:8

In the Anselm Project Bible: The APB presents the term as “the appointed staff” in Isaiah 30:32 and as “foundations” in Ezekiel 41:8. These renderings identify the clauses' presentation rather than a fixed English equivalent.