So I randomly found this uncited on Reddit (and keep in mind this could well be a fake sutta because it is uncited):
Buddha and Ananda were walking thorugh a forest in Autumn (fall).
Ananda asked Buddha after being with him for many year,"Have you told us everything about the Truth? Is there anything you have kept secret or anything that you did not want to tell?
The forest was fully covered with fall leaves. Buddha bent down and grabbed as many leaves as he can and said," This is all I can say. The Truth is like all these fallen leaves in the forest. The Truth is larger than anything we could ever imagine and the language we use is mediocre compared to the Truth. I cannot say everything about the Truth. You will have to know it yourself. That is the only way to know It."
It has the dialogue between Ven Ananda and the Buddha. Iāll do some more looking to see if this came from anywhere.
EDIT: this one is fake. It is just a coincidence both this one and what Ven Bhavaviveka cites both have Ven Ananda.
Says the person who posted it on Reddit: āI heard this story from an enlightened master and so I put it in my own words.ā
Yes. That is how it works when you get a teaching from an alleged enlightened master, you change it to suit yourself better.