'Duty' in the Bible

“We found the prison securely locked and the guards standing at the doors, but when we opened [the doors], we found no one inside.”

Therefore, brothers, choose from among you seven men with good reputations [men of godly character and moral integrity], full of the Spirit and of wisdom, whom we may put in charge of this task.

Then Paul, looking intently at the Council (Sanhedrin, Jewish High Court), said, “Kinsmen, I have lived my life before God with a perfectly good conscience until this very day.”

“So then, I [once] thought to myself that it was my duty to do many things in opposition to the name of Jesus of Nazareth.