ASV: And working together with him we entreat also that ye receive not the grace of God in vain

BBE: We then, working together with God, make our request to you not to take the grace of God to no purpose.

DBY: But as fellow-workmen, we also beseech that ye receive not the grace of God in vain:

KJV: We then, as workers together with him, beseech you also that ye receive not the grace of God in vain.

WEY: And you also we, as God's fellow workers, entreat not to be found to have received His grace to no purpose.

WBS: We then, as co-workers with him, beseech you also that ye receive not the grace of God in vain.

WEB: Working together, we entreat also that you not receive the grace of God in vain,

YLT: And working together also we call upon 'you' that ye receive not in vain the grace of God --
