Taken from The Attributes of God by A W Tozer
pg. 64– The popular idea is a great error because the God of the Old Testament and the God of the New is one God. He did not change (bold ours)
People tend to think that there are two different Gods of the Bible or somewhere in the silent 400 years between testaments God changed. Neither idea is so. The God of the OT is the same God found in the NT. If you need an example just compare the flood of Genesis with the final judgment found in Revelation.