He hath also broken my teeth with gravel stones; i.e. he hath given me stones instead of bread (comp. Matthew 7:9). The Jewish rabbi commonly called Rashi thinks that a historical fact is preserved in these words, and that the Jewish exiles were really obliged to eat bread mixed with grit, because they had to bake in pits dug in the ground.
So too many later commentators, e.g. Grotius, who compares a passage of Seneca ('De Benefic.,' 2.7), "Beneficium superbe datum simile est pani lapidoso." He hath covered me with ashes; rather, he hath pressed me down into ashes.
A figurative expression for great humiliation. So in the Talmud the Jewish nation is described as "pressed down into ashes" ('Bereshith Rabba,' 75).