Sworn to answer when called upon.
Game of Thrones Season 6, Episode 7
SWORN brother of the Night's Watch,
Game of Thrones Season 7, Episode 2
The men of the Night's Watch
are SWORN to play no part...
Game of Thrones Season 5, Episode 1
I've SWORN to serve the Lord of Riverrun
and obey his commands.
Game of Thrones Season 6, Episode 8
She's SWORN to protect
both of Catelyn Stark's girls.
Game of Thrones Season 7, Episode 6