Hobbit

1) The title of the chapter, "On the Doorstep."

2) "If the map was true, somewhere high above the cliff at the valley's head must stand the secret door. Day by day they came back to their camp without success."

3) "No sign was there of post or lintel or threshold, nor any sign of bar or bolt or key-hole; yet they did not doubt that they had found the door at last."

4)  "At that very moment he heard a sharp crack behind him. There on the grey stone in the grass was an enormous thrush, nearly coal black, its pale yellow breast freckled dark spots. Crack! It had caught a snail and was knocking it on the stone. Crack! Crack!

Suddenly Bilbo understood. Forgetting all danger he stood on the ledge and hailed the dwarves, shouting and paying. Those that were nearest came tumbling over the rocks and as fast as they could along the ledge to him, wondering what on earth was the matter; the others shouted to be hauled up the ropes (except Bombur, of course: he was asleep)."