The LORD will make Himself known to Egypt, and on that day Egypt will acknowledge the LORD. They will worship with sacrifices and offerings; they will make vows to the LORD and fulfill them.
Jewish Publication Society of America Version (JPS1917) - Isaiah 19:21 >And the LORD shall make Himself known to Egypt, and the Egyptians shall know the LORD in that day; yea, they shall worship with sacrifice and offering, and shall vow a vow unto the LORD, and shall perform it.