Luke 22:32

But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren.
— Luke 22:32, King James Version

In other translations

World English Bible (WEB)

but I prayed for you, that your faith wouldn't fail. You, when once you have turned again, establish your brothers."

American Standard Version (ASV)

but I made supplication for thee, that thy faith fail not; and do thou, when once thou hast turned again, establish thy brethren.

Young's Literal Translation (YLT)

and I besought for thee, that thy faith may not fail; and thou, when thou didst turn, strengthen thy brethren.'