Isaiah
King James Version (KJV)

“The smith with the tongs both worketh in the coals, and fashioneth it with hammers, and worketh it with the strength of his arms: yea, he is hungry, and his strength faileth: he drinketh no water, and is faint.”
King James Version (KJV)
44:12 Faint - This is mentioned as an evidence of great zeal and industry in carrying on this work; so that they forget or neglect to eat and drink.