David
Psalm 102:9BSB·traditional attribution

For I have eaten ashes like bread and mixed my drink with tears

John Calvin Reformed @genevareformer

PSALM 102 This prayer seems to have been dictated to the faithful when they were languishing in captivity in Babylon. Sorrowful and humbled, they first bewail their afflictions. In the next place, they plead with God for the restoration of the holy city and temple.

Commenting on Psalm 102:1-28

C.H. Spurgeon Reformed Baptist @princeofpreachers

For I have eaten ashes like bread. He had so frequently cast ashes upon his head in token of mourning, that they had mixed with his ordinary food, and grated between his teeth when he ate his daily bread. One while he forgot to eat, and then the fit changed, and he ate with such a hunger that even ashes were devoured. Grief has strange moods and tenses.

Matthew Henry Presbyterian @wholebiblehenry

The title of this psalm is very observable; it is a prayer of the afflicted. It was composed by one that was himself afflicted, afflicted with the church and for it; and on those that are of a public spirit afflictions of that kind lie heavier than any other.

Commenting on Psalm 102:1-11