'Revenue' in the Bible

Now let it be known to the king, that if that city is rebuilt and the walls are finished, then they will not pay tax, custom, or toll, and the revenue of the kings will be diminished.

Also, I issue a decree as to what you are to do for these Jewish elders for the rebuilding of this house of God: the full cost is to be paid to these people from the royal treasury out of the taxes of the provinces west of the River, and that without delay.