Above the ark were the cherubim of the Glory, overshadowing the atonement cover. But we cannot discuss these things in detail now. (NIV)
Above [the ark] and overshadowing the mercy seat were the representations of the cherubim [winged creatures which were the symbols] of glory. We cannot now go into detail about these things. (AMP)
And over it the cherubims of glory shadowing the mercyseat; of which we cannot now speak particularly. (KJV)