45 The two words can form a nominal hendiadys, “a dreadful fear,” though most English versions retain the two separate terms.
46 The form is an imperfect.
47 The adjective is in construct form and governs the noun “arm” (“arm” being the anthropomorphic expression for what God did). See §132.c.
48 For a study of the words for fear, see N. Waldman, “A Comparative Note on Exodus 15:14–16,” 66 (1976): 189–92.
49 Clauses beginning with עַד (’ad) express a limit that is not absolute, but only relative, beyond which the action continues ( §138.g).
50 The verb קָנָה (qanah) here is the verb “acquire, purchase,” and probably not the homonym “to create, make” (see Gen 4:1; Deut 32:6; and Prov 8:22).

In other versions

Terror and dread fall upon them;

because of the greatness of your arm, they are still as a stone,

till your people, O Lord, pass by,

till the people pass by whom you have purchased.

terror and dread will fall on them.

By the power of your arm

they will be as still as a stone—

until your people pass by, Lord,

until the people you bought pass by.

terror and dread will fall on them.

They will be as still as a stone

because of your powerful arm

until your people pass by, Lord,

until the people whom you purchased pass by.

terror and dread fall upon them.

The power of your arm

makes them lifeless as stone

until your people pass by, O Lord,

until the people you purchased pass by.

Terror and dread fell on them;

at the greatness of your arm they became silent like the stone,

until your people passed by, Yahweh,

until the people whom you bought passed by.

Fear and dread shall fall upon them;

By the greatness of thine arm they shall be as still as a stone;

Till thy people pass over, O Lord,

Till the people pass over, which thou hast purchased.

Public Domain