Bede

He did not eat bread, etc. Here they will have an excellent example not only of weeping and praying, but also of fasting for those who have sinned; and since blessed are those who mourn, who weep for their own sins, because after receiving remission, they are comforted, how much more are they to be believed blessed, who also mourn for the errors of their brothers; and this to such an extent that they do not even want to touch bread and water, which is the nourishment of those who abstain, nor enter their house, or ascend to their …

Commentary on Ezra and Nehemiah ↗