Acts 22:10

which are appointed for thee to do God explained this to Ananias (see Acts 9:15), how Saul was a chosen vessel to bear His name before Gentiles and kings and the children of Israel; and still more about his labours was to be revealed to the new Apostle himself. According to Acts 26:16-18 the character of the work to which he was called was from the first indicated to Saul; though as no mention is made of Ananias in that passage, it may well be that the Apostle there brings into one statement both the words he heard on the way, and those which were afterwards spoken to him by Ananias.