But I have prayed for you, so that your faith may not fail, and so that you, once converted, may confirm your brothers.
Other versions
King James Version
But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren.English Standard Version
but I have prayed for you that your faith may not fail. And when you have turned again, strengthen your brothers."New International Version
But I have prayed for you, Simon, that your faith may not fail. And when you have turned back, strengthen your brothers."