Je was op zoek naar: singleness (Engels - Baskisch)

and they, continuing daily with one accord in the temple, and breaking bread from house to house, did eat their meat with gladness and singleness of heart,
eta egun oroz perseueratzen çutén gogo batez templean, eta hausten çutela oguia etchez etche, hartzen çuten bere othorançá alegrançarequin eta bihotzezco simplicitaterequin:

servants, be obedient to them that are your masters according to the flesh, with fear and trembling, in singleness of your heart, as unto christ;
cerbitzariác, obeditzaçue haraguiaren arauez çuen nabussi diradenac, beldurrequin eta ikararequin, çuen bihotzeco simplicitaterequin, christ beçala.

servants, obey in all things your masters according to the flesh; not with eyeservice, as menpleasers; but in singleness of heart, fearing god:
cerbitzariác, obeditzaçue gauça gucietan çuen nabussi carnalac, ez beguiaren araura cerbitzatzen dituçuela, guiçonén gogara eguin nahi bacindute beçala, baina bihotzeco simplicitaterequin, iaunaren beldur çaretelaric.