'Spoken by the Prophet' in the Bible

All this happened for the fulfilment of what the Lord had spoken by the prophet:

Now when evening came they brought him many demoniacs, and he cast out the spirits with a word and healed all the invalids ??17 that the word spoken by the prophet Isaiah might be fulfilled, He took away our sicknesses and he removed our diseases.

This took place for the fulfilment of what had been spoken by the prophet,

Then the word spoken by the prophet Jeremiah was fulfilled: and I took the thirty silver pieces, the price of him who had been priced, whom they had priced and expelled from the sons of Israel;