Ezekiel 20:8

“But they rebelled against me and would not listen to me. They did not every man cast away the abomination of their eyes, nor did they forsake the idols of Egypt. Then I said I would pour out my fury on them, to accomplish my anger against them in the land of Egypt.”

The people were continually rebellious and refused to obey God. This clearly went on even while Yahweh was working to deliver them. Thus He had intended again to bring on them His fury, something which they had already tasted in their bondage. But, as He then tells us, He did not do so. And why? Not for their sakes but for the sake of His own name and reputation. We must recognise that this ‘change of mind' is putting what happened as a drama in human terms, depicting it as seen by men. God knew all along what He was going to do.