In all of Balaam's blessings, nearly every phrase is repeated in similar wording. For example:
Arise, Balak, and hear - listen closely to me, son of Zippor.
God is not a man that He should lie - nor is He a mortal that He should relent.
Would He say and not do - speak and not fulfill?
I have received [an instruction] to bless - and bless, I cannot retract it.
He does not look at evil in Jacob - and has seen no perversity in Israel
the Lord, his God, is with him - and he has the King's friendship.
(Bamidbar 22:18-21, translation: Chabad.org)
While repetition is fairly common in Biblical poetry, the pattern here of nearly perfect pairs is unusual. Is there an explanation of this?