the First Temple: The Oracle or Most Holy Place was Twenty Cubits Every Way
Source: TTT
1 Kings 6:16, 20
He partitioned off the twenty cubits at the rear of the temple with cedar boards from floor to ceiling to form within the temple an inner sanctuary, the Most Holy Place. / The inner sanctuary was twenty cubits long, twenty cubits wide, and twenty cubits high. He overlaid the inside with pure gold, and he also overlaid the altar of cedar.