Genesis 1:20

20 God said, “Let the water swarm with swarms
The Hebrew text again uses a cognate construction (“swarm with swarms”) to emphasize the abundant fertility. The idea of the verb is one of swift movement back and forth, literally swarming. This verb is used in Exod 1:7 to describe the rapid growth of the Israelite population in bondage.
of living creatures and let birds fly
The Hebrew text uses the Polel form of the verb instead of the simple Qal; it stresses a swarming flight again to underscore the abundant fruitfulness.
above the earth across the expanse of the sky.”
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