Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
The tabernacle, the great glory of which was that it contained "the testimony", i.e., the "two tables" (Ex. 38:21). The ark in which these tables were deposited was called the "ark of the testimony" (40:3), and also simply the "testimony" (27:21, 30:6).