User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5619706-20121108182206/@comment-5110811-20121203233719

What the hell are you talking about??? Lucifer didn't mention anything about leviathans except in Sam's hallucinations, when he posed as Dean in season 7.

Where was it ever mentioned or even hinted that the Leviathans ever visited, let alone lived, in heaven?