'Whereof' in the Bible

and the sign or the wonder come to pass, whereof he spake unto thee, saying, Let us go after other gods, which thou hast not known, and let us serve them;

Jehovah will smite thee with the boil of Egypt, and with the emerods, and with the scurvy, and with the itch, whereof thou canst not be healed.

Jehovah will smite thee in the knees, and in the legs, with a sore boil, whereof thou canst not be healed, from the sole of thy foot unto the crown of thy head.

And Jehovah will bring thee into Egypt again with ships, by the way whereof I said unto thee, Thou shalt see it no more again: and there ye shall sell yourselves unto your enemies for bondmen and for bondwomen, and no man shall buy you.