'Sweat' in the Bible

in the sweat of thy face shalt thou eat bread, till thou return unto 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 themselves with anything that causeth'sweat.

And being in an agony he prayed more earnestly; and his sweat became as it were great drops of blood falling down upon the ground.