Washing away merit & Cittalapabbata references

Greetings,

Would anyone by chance know the precise references for the following two
statements?

1: “When Brahmins said that they could wash away their sins by bathing
in sacred rivers, the Buddha joked that the water might wash away their
good deeds also.”

2: “There were so many arahants flying through the sky around
Cittalapabbata monastery in the Roha.na kingdom that the farmers' crops
did not grow well due to lack of sunlight.''

I was told that 1 is from the Jaataka- commentary and that 2 might be
from the Mahaava.msa subcommentary.

The statements probably differ from the originals somewhat. I need them
for a book that I am editing.

Best wishes,
Bh. Nyanatusita