Translations
But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the LORD had said.
But when Par'oh saw there was relief, he made his own heart heavy and would not listen to them — just as YHWH had spoken.
But when Pharaoh saw there was breathing room, he hardened his own heart and refused to listen to them — just as Yahweh had said.
When Pharaoh saw that there was relief, however, he hardened his heart and would not listen to Moses and Aaron, just as the LORD had said.

