His own guards are SWORN to keep him safe.
Game of Thrones Season 2, Episode 5
Could have SWORN those were shark fins.
Game of Thrones Season 5, Episode 4
Sworn to Renly Baratheon, Catelyn Stark,
and now my brother.
Game of Thrones Season 4, Episode 2
I've SWORN to serve the Lord of Riverrun
and obey his commands.
Game of Thrones Season 6, Episode 8
leaving us unable to carry out our duties
as SWORN brothers of the Night's Watch.
Game of Thrones Season 4, Episode 7