'Sweat' in the Bible

In the sweat of thy face shalt thou eat bread, until thou return to the ground: for out of it wast thou taken. For dust thou art; and unto dust shalt thou return.

They shall have linen tires upon their heads, and shall have linen breeches upon their loins; they shall not gird on anything that causeth sweat.

And being in conflict he prayed more intently. And his sweat became as great drops of blood, falling down upon the earth.