Before morning the rain ceased, and a wind stirred in the trees. Dawn came more brightly than for many days, and light airs from the South opened the sky, pale and clear about the rising of the sun. Mîm sat on without moving, and he seemed as if dead; for now the heavy lids of his eyes were closed, and the morning-light showed him withered and shrunken with age. Túrin stood and looked down on him. ‘There is light enough now,’ he said.
Then Mîm opened his eyes and pointed to his bonds; and when he was released he spoke fiercely. ‘Learn this, fools!’ he said. ‘Do not put bonds on a Dwarf! He will not forgive it. I do not wish to die, but for what you have done my heart is hot. I repent my promise.’
"Of Mîm the Dwarf” - The Children of Húrin - J. R. R. Tolkien