Psalm 89/Notes/Verbal.v. 20.778986
From Psalms: Layer by Layer
On the use of isolated wayyiqtol's in poetry, see Cook 2024, 150, who claims it is used in "instances in which the [wayyiqtol] is closely (or immediately) juxtaposed with a [qatal] form that is synonymous, antithetical, or otherwise forms a poetic word pair or expresses an isolated past event." In this case, דִּבַּרְתָּֽ and וַתֹּאמֶר are synonymous.