NET
2 If I am not an apostle to others, at least I am to you, for you are the confirming sign of my apostleship in the Lord.
Darby
2 If I am not an apostle to others, yet at any rate I am to you: for the seal of mine apostleship are *ye* in [the] Lord.
KJV
2 If I be not an apostle unto others, yet doubtless I am to you: for the seal of mine apostleship are ye in the Lord.