'As It is Written' in the Bible

As it is written in the prophet Isaiah, Here I send my messenger before your face to prepare the way for you:

He said to them, "Isaiah made a grand prophecy about you hypocrites ??as it is written, This people honours me with their lips, but their heart is far away from me:

As for Elijah, I tell you he has come already, and they have done to him whatever they pleased ??as it is written of him."