
Never failed in his DUTY.
Game of Thrones Season 3, Episode 4

I believe you both have guard DUTY tonight.
Game of Thrones Season 5, Episode 7

Love is the death of DUTY.
Game of Thrones Season 4, Episode 9

only to fulfil my DUTY.
Money Heist Season 1, Episode 13

Even if he does, Sansa will do her DUTY.
Game of Thrones Season 2, Episode 3