Acts 2:28-29

Acts 2:28-29. Thou hast made known to me the ways of life; thou shalt make me full of joy with thy countenance. Men and brethren, let me freely speak unto you of the patriarch David, that he is both dead and buried, and his sepulcher is with us unto this day.

Peter craves liberty to speak with freedom, and then he very shrewdly gives to David the high title of patriarch, which is not generally given to him, so as to win their attention and approval: "Let me freely speak unto you of the patriarch David, that he is both dead and buried, and his sepulcher is with us unto this day," and therefore he did not speak about himself in the words Peter was quoting.