We're both SWORN to King Stannis.
Game of Thrones Season 3, Episode 1
He's SWORN to treat all wounded men,
friend or foe.
Game of Thrones Season 4, Episode 10
She's SWORN to protect
the Stark girls, so...
Game of Thrones Season 8, Episode 4
Ser Amory Lorch,
SWORN bannerman to Lord Tywin Lannister.
Game of Thrones Season 2, Episode 3
I am SWORN to serve you.
Game of Thrones Season 3, Episode 3