Adam Clarke on Acts 28:20

For the hope of Israel I am bound, etc. - As if he had said: This, and this alone, is the cause of my being delivered into the hands of the Romans; I have proclaimed Jesus as the Messiah; have maintained that though he was crucified by the Jews, yet he rose again from the dead; and, through him, I have preached the general resurrection of mankind: this all Israel professes to hope for; and yet it is on this account that the Jews persecute me. Both the Messiah and the resurrection might be said to be the hope of Israel; and it is hard to tell which of them is here meant: see Act 13:6; Act 24:15, Act 24:21; Act 26:6. It is certain that, although the Jews believed in the general resurrection, yet they did not credit it in the manner in which Paul preached it; for he laid the foundation of the general resurrection on the resurrection of Christ.