Acts 5:16

And there also came together the multitude from cities round about Jerusalem, bringing sick folk, and them that were vexed with unclean spirits: and they were healed every one.

Every one ... There were no failures among the cures wrought by the Twelve, thus making it clear that the phenomenon in view here was in no manner akin to the faith healing crusades of our own day, in which failure is their principal feature and the "cure" is always questionable.