Arya Stark (with Walder’s face on): You didn’t slaughter every one of the Starks. No, no, that was your mistake. You should have ripped them all out, root and stem. Leave one wolf alive and the sheep are never safe.

(Every men is poisoned by the wine and Arya reveals herself)

Arya Stark (to Walder’s wife): When people ask you what happened here… tell them the North remembers. Tell them winter came for House Frey.

From Game of Thrones – Season 7 Episode 1: ‘Dragonstone’ (7×01)