opening scene, arya and jaqen in the house of black and white

arya asks which of the idols represents the many-faced god ("i see the stranger, the drowned god, the weirwood face...")

jaqen: "there is only one god. a girl knows his name, and all men know his gift"

cut to dead body of the praying man from earlier in the scene

an obvious callback to syrio forel's famous line from S1 ("there is only one god and his name is death. and there is only one thing we say to death: not today")