'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, select from among you seven men of good reputation, full of the Spirit and wisdom, whom we can appoint to this duty.

Now when Herod was on the point of taking him out of prison, that very night Peter was asleep between two soldiers, bound with two chains, and guards were on duty outside the door.

"And now, impelled by a sense of duty, I am on my way to Jerusalem, not knowing what will happen to me there,

But even the sacrifice of my life I count as nothing, if only I may perfect my earthly course, and be faithful to the duty which the Lord Jesus has entrusted to me of proclaiming, as of supreme importance, the Good News of God's grace.

Paul looked straight at the Council and said, "Brothers, with a clear conscience I have done my duty before God up to this very day."

Indeed, I myself thought it my duty to take extreme measures against the name of Jesus from Nazareth.