If you quote this verse in “full”, you will see a deeper meaning:
Namely —> God doesn’t change —> with respect to “destroying” (completely) –> in the ‘context’ it was Uttered:
Don’t believe me? Check your own Bibles and compare with this:
“Because I the LORD don’t change; therefore you children of Jacob aren’t destroyed.” (Malachi 3:6)
It was “not” in the context of tithes but of His ‘destroying punishment’ that God changes not even when Israel broke His commandments.
God is Good.
‘Blessed Saviour of the World’