'Whereunto' in the Bible

Now when the captain of the temple and the chief priests heard these words, they were much perplexed concerning them whereunto this would grow.

And as they ministered to the Lord, and fasted, the Holy Spirit said, Separate me Barnabas and Saul for the work whereunto I have called them.

and with difficulty coasting along it we came unto a certain place called Fair Havens; nigh whereunto was the city of Lasea.