'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 bonnets upon their heads, and shall have linen breeches upon their loins; they shall not gird themselves with any thing that causeth sweat.

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