Revelation 22:2 says the leaves of the tree of life are for what?

Answer: The healing of the nations

The tree of life bears twelve kinds of fruit, a crop each month, "and the leaves of the tree are for the healing of the nations."

“down the middle of the main street of the city. On either side of the river stood a tree of life, bearing twelve kinds of fruit and yielding a fresh crop for each month. And the leaves of the tree are for the healing of the nations.”— Revelation 22:2 (BSB)