'Sweat' in the Bible

By the sweat of your face will you eat bread until you return to the ground, for out of it you were taken. For you are dust, and to dust you shall return."

They shall have linen tires on their heads, and shall have linen breeches on their waists; they shall not clothe themselves with [anything that causes] sweat.

Being in agony he prayed more earnestly. His sweat became like great drops of blood falling down on the ground.