Acts 11:28 Then one of them, named Agabus, stood up and showed by the Spirit that there was going to be a great famine throughout all the world, which also happened in the days of Claudius Caesar.
I find it very interesting a prophet was named at this time since many believe prophets were only around before Christ to give a way for the people to hear from God.
God continues to speak to people through various means and wants His message and warnings to be told to others; we just have to be careful to make sure they are prophets from God.
He has warned us there will be plenty of people coming forward pretending to be from God; we have to make up our minds who is real. Trust God to guide you.