mas.sah is a proper place name associated with Israel's testing of the LORD and quarreling.

The term is used consistently as a proper place name: the place is recalled for Israel's testing of the LORD, quarreling, and provocation, and is paired with Meribah in two verses.

1. Place recalled for testing and contention · dominant

   The proper-noun form identifies a place in each occurrence. In Exodus 17:7 the APB renders the naming of the place amid Israel's quarreling and their question whether the LORD was among them; Deuteronomy 6:16 recalls testing the LORD there, while Deuteronomy 9:22 names it among places of provocation. In Deuteronomy 33:8 the APB places the testing there alongside contention at the waters of Meribah.

   Exodus 17:7Deuteronomy 6:16Deuteronomy 9:22Deuteronomy 33:8

In the Anselm Project Bible: The APB presents the term as the name “Massah” in all four verses, either in the account of naming the place or in later recollections of events there. The surrounding descriptions of testing and quarreling confirm the episode rather than independently define the name.