Pitch

Concise Bible Dictionary:

A kind of bitumen. Noah covered the ark with pitch inside and outside (Gen. 6:1414Make thee an ark of gopher wood; rooms shalt thou make in the ark, and shalt pitch it within and without with pitch. (Genesis 6:14)). The ark in which the infant Moses was put, was likewise thus rendered waterproof (Ex. 2:33And when she could not longer hide him, she took for him an ark of bulrushes, and daubed it with slime and with pitch, and put the child therein; and she laid it in the flags by the river's brink. (Exodus 2:3)). Among God’s judgments on the earth the streams are turned into pitch, and the land into burning pitch (Isa. 34:99And the streams thereof shall be turned into pitch, and the dust thereof into brimstone, and the land thereof shall become burning pitch. (Isaiah 34:9)). Different words are employed in the Hebrew of Genesis 6:1414Make thee an ark of gopher wood; rooms shalt thou make in the ark, and shalt pitch it within and without with pitch. (Genesis 6:14) from the other passages. Noah was to pitch (kaphar, “to cover,” often translated “atonement”) the ark with pitch (kopher, translated “ransom”) as if to teach that Noah and those with him could be saved only by being covered with a ransom, and which would introduce them to a new earth.