From "Game of Thrones: The Pointy End (#1.8)"
There must always be a Stark in Winterfell. Until I return that will be you. You are not to leave the castle walls while we are gone, do you understand? Listen to Maester Luwin. Look after your little brother.
I'll send messages whenever I can. If you don't hear from me, don't be scared. Til I return.