Question: where in the bible does it mention upper room?
Answer: "Upper room" is derived from the Gospel of Mark and the Gospel of Luke, which both employ the Koine Greek: αναγαιον, anagaion, (Mark 14:15 and Luke 22:12), whereas the Acts of the Apostles uses Koine Greek: ύπερωιον, hyperōion (Acts 1:13), both with the meaning "upper room".