You were Catelyn Stark's SWORN sword?
Game of Thrones Season 5, Episode 2
and SWORN brother of the Night's Watch,
ever faithful.
Game of Thrones Season 5, Episode 7
All of them have SWORN upon their rings
to keep this meeting a secret.
Vikings Season 1, Episode 2
You've harmed others,
those you were SWORN to protect,
Game of Thrones Season 2, Episode 8
I've SWORN to protect you, my lady.
Game of Thrones Season 6, Episode 5