I might get shot for this, but if your serving it at home, I'd reheat in the microwave...Its always worked for me. Comes out nice and moist. Try a piece first and see if it works for you. Another favorite way for me is to make a beef broth, get it boiling hot and ladel it over the sliced brisket..Sort of like an a'jus.
"I love my country, I love my guns, I love my family, I love the way it is now. And anybody that tries to change it, has to come through me. That should be all of our attitudes.
Cause this is America and a country boy is good enough for me, son."
- Charlie Daniels