mas.sah denotes trials seen in Egypt and also names the wilderness day recalled as a warning against hard hearts.

The plural forms refer to trials connected with what Israel saw in Egypt, while the proper-noun form identifies the wilderness setting or day invoked in a warning against hardening the heart.

1. Trials witnessed in Egypt · dominant

   The plural noun occurs in accounts of what Israel saw in Egypt. In Deuteronomy 4:34 the APB renders God's taking a nation "by trials, by signs, by wonders," and in Deuteronomy 7:19 it renders "The great trials that your eyes saw" alongside signs and wonders; Deuteronomy 29:2 likewise recalls all that the LORD did before Israel's eyes in Egypt, though the APB does not isolate the term there.

   Deuteronomy 29:2Deuteronomy 4:34Deuteronomy 7:19
2. The wilderness day recalled as a warning · occasional

   In Psalm 95:8 the form is tagged as a proper noun and occurs in the comparison forbidding hardened hearts. The APB renders the surrounding phrase "as on the day of trial in the wilderness," but its loose wording does not determine how the proper-noun form is represented individually.

   Psalm 95:8

In the Anselm Project Bible: The APB explicitly uses "trials" in Deuteronomy 4:34 and Deuteronomy 7:19, while Psalm 95:8 has "the day of trial in the wilderness." In Deuteronomy 29:2 it recalls what the LORD did in Egypt without an evident separate English counterpart for the term.