I'm ready to swear your OATH.
Game of Thrones Season 1, Episode 1
Where's that written? I can and I will.
The Kingsguard OATH is for life.
Game of Thrones Season 4, Episode 1
I remember every word of the OATH.
Game of Thrones Season 3, Episode 10
for your violation of your sacred OATH
to marry one of his daughters.
Game of Thrones Season 3, Episode 6
I swore an OATH to House Tyrell.
Game of Thrones Season 7, Episode 2