Charles Ellicott Commentary Psalms 124:5

"Then the proud waters had gone over our soul." — Psalms 124:5 (ASV)

Proud. —The Hebrew presents a rare form, which is considered indicative of later composition. For the epithet, compare Æ schylus, Prom. Vinct. 717:

“And you will reach the scornful river—well it deserves
the name.”