Does anyone know which is the episode in which Sam throws a white flare to shield himself and Dean inside a house?

It's in Season 1 Episode 16 "Shadow"
They're being attacked by shadow demons called daevas. The bright light of the flare disintegrates the demons so that they can escape.

"Shadow" he's saving Dean and John from the shadow demon things that Meg unleashed on them.

i beleive it was shadow

it was season 1 and meg was trying to kill john and the boys.