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.
KJV
And the LORD shall be known to Egypt, and the Egyptians shall know the LORD in that day, and shall do sacrifice and oblation; yea, they shall vow a vow unto the LORD, and perform [it].
ASV
And Jehovah shall be known to Egypt, and the Egyptians shall know Jehovah in that day; yea, they shall worship with sacrifice and oblation, and shall vow a vow unto Jehovah, and shall perform it.