NET
6 But Christ is faithful as a son over God’s house. We are of his house, if in fact we hold firmly to our confidence and the hope we take pride in.
Darby
6 but Christ, as Son over his house, whose house are *we*, if indeed we hold fast the boldness and the boast of hope firm to the end.
KJV
6 But Christ as a son over his own house; whose house are we, if we hold fast the confidence and the rejoicing of the hope firm unto the end.