if cell contains certain number then copy

A simple explanation of what I am having troubles with:

Sheet 1 Column A: List of 39130 order numbers Sheet 1 Column B: tax number associated to Column A Sheet 2 Column A: List of 24 different numbers with same values as Sheet 1 Column B Sheet 2 Column B: A list of tax numbers

So, I'm looking to search sheet 1 column A for a value that matches sheet 2 column A, and return the value of Sheet 2 Column be in a new column (G)

How can i do that?