Exodus 5:9 New English Translation

⁹Make the work harder^[a] for the men so they will keep at it^[b] and pay no attention to lying words!”^[c]

Exodus 5:9 tn Heb “let the work be heavy.”
Exodus 5:9 tn The text has וְיַעֲשׂוּ־בָהּ (v^eyaʿasu vah, “and let them work in it”) or the like. The jussive forms part of the king’s decree that the men not only be required to work harder but be doing it: “Let them be occupied in it.”sn For a discussion of this whole section, see K. A. Kitchen, “From the Brickfields of Egypt,” TynBul 27 (1976): 137-47.
Exodus 5:9 sn The words of Moses are here called “lying words” (דִבְרֵי־שָׁקֶר, divre shaqer). Here is the main reason, then, for Pharaoh’s new policy. He wanted to discredit Moses. So the words that Moses spoke Pharaoh calls false and lying words. The world was saying that God’s words were vain and deceptive because they were calling people to a higher order. In a short time God would reveal that they were true words.

New English Translation (NET)