John Calvin on Exodus 8:27

27. We will go three days’ journey. This is the conclusion that no change must be made in God’s command, but that His injunction must be obeyed simply, and without exception. Nor is there little praise due to the firmness of Moses, who so boldly and unreservedly rejected the pretended moderation of the tyrant, because it would have somewhat interfered with the will of God. He therefore declares that the Israelites would do no otherwise than as God had prescribed.

Exodus 8:28-32

28. And Pharaoh said, I will let you go, that ye may sacrifice to the Lord your God in the wilderness; only ye shall not go very far away: entreat for me.

28. Tunc dixit Pharao, Ego dimittam vos ut sacrificetis Jehovae Deo vestro: veruntamen non longius pergetis eundo: orate pro me.

29. And Moses said, Behold, I go out from thee, and I will entreat the Lord that the swarms of flies may depart from Pharaoh, from his servants, and from his people, tomorrow: but let not Pharaoh deal deceitfully any more in not letting the people go to sacrifice to the Lord.

29. Et dixit Moses, Ecce, ego egrediar a te, et rogabo Jehovam ut recedat examen insectorum a Pharaone, et a servis ejus, et a populo ejus eras. Veruntamen non adjiciat Pharao agere fallaciter, non dimittendo populum ut sacrificet Jehovae.

30. And Moses went out from Pharaoh, and entreated the Lord.

30. Tunc egressus est Moses a Pharaone, et oravit ad Jehovae.

31. And the Lord did according to the word of Moses; and he removed the swarms of flies from Pharaoh, from his servants, and from his people: there remained not one.

31. Et fecit Jehova secundum verbum Mosis, et recessit mixtura insectorum a Pharaone, et a populo ejus: non unum fuit residuum.

32. And Pharaoh hardened his heart at this time also, neither would he let the people go.

32. Et aggravavit Pharao cor suum etiam hac vice, nec dimisit populum.