Skimming a bit through the LotR drafts in HoMe again…

‘I saw you!’ said Frodo, 'walking backwards and forwards: the moon shone in your hair.’

Gandalf looked at him in amazement. 'Wake up, Frodo,’ he said, 'you are dreaming.’

'I was dreaming,’ said Frodo. 'Your words suddenly recalled a dream I had. I thought it was only a dream and had forgotten it. I think it was in Bombadil’s house. I saw a shadow – ’

'That’s enough!’ laughed Gandalf. 'It was a dream, but a true one, it seems. However, the story is mine, and you need not spoil the telling of it.’

Gandalf cares about spoilers.