Bede

And up to the tower of a hundred cubits, etc. For priests build up to the measure of a hundred cubits, when they kindle all whom they instruct with love and desire for eternal things. For the number one hundred, which in the counting of fingers passes from the left to the right, represents heavenly goods, which, in comparison to temporal and lesser goods, are as the right hand to the left. …

Commentary on Ezra and Nehemiah ↗