NET
11 as you also join in helping us by prayer, so that many people may give thanks to God on our behalf for the gracious gift given to us through the help of many.
Darby
11 ye also labouring together by supplication for us that the gift towards us, through means of many persons, may be the subject of the thanksgiving of many for us.
KJV
11 Ye also helping together by prayer for us, that for the gift [bestowed] upon us by the means of many persons thanks may be given by many on our behalf.