Genesis 49:24בְּאֵיתָן
Yet he steadied his bow, and his strong arms were tempered by the hands of the Mighty One of Jacob, in the name of the Shepherd, the Rock of Israel,
Exodus 14:27לְאֵיתָנוֹ
So Moses stretched out his hand over the sea, and at daybreak the sea returned to its normal state. As the Egyptians were retreating, the LORD swept them into the sea.
Numbers 24:21אֵיתָן
Next he saw the Kenites and lifted up an oracle, saying: “Your dwelling place is secure, and your nest is set in a cliff.
Deuteronomy 21:4אֵיתָן
bring the heifer to a valley with running water that has not been plowed or sown, and break its neck there by the stream.
Job 12:19וְאֵתָנִים
He leads priests away barefoot and overthrows the established.
Jeremiah 49:19אֵיתָן
Behold, one will come up like a lion from the thickets of the Jordan to the watered pasture. For in an instant I will chase Edom from her land. Who is the chosen one I will appoint for this? For who is like Me, and who can challenge Me? What shepherd can stand against Me?”

Brown-Driver-Briggs

אֵיתָן, אֵתָן adj. perennial, ever-flowing, fig. permanent, as subst, steady flow, permanence

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.