"[1] The Westminster Shorter Catechism says that "[God] is a spirit, whose being, wisdom, power, holiness, justice, goodness, and truth are infinite, eternal, and unchangeable."
[3] While most Christians believe that there are aspects of God that do not change, opponents believe that the benevolence of God is often expressed through his willingness to change his promised course of action which implies a certain level of mutability.
(See Exodus 32:14 and Numbers 14:12-20; Jonah 3:10; Amos 7:3-9; Jeremiah 26:3) For example, when God was giving the law and the Ten Commandments to Moses, he was gone for so long that Aaron, his brother the high priest, and the people, thought that he was dead or that something had happened, and the people asked Aaron to build them the Golden Calf.
On that occasion, and during another when the people rebel against Moses and God, God threatens to destroy the people and make a nation out of Moses alone, but Moses reminds God of the promise he made to Abraham to make Israel a great nation.
God relents, but says that all those who participated will not be allowed to enter Canaan, the promised land.