Where is the sutta passage for the following citation of the description of a kalpa?

Can someone provide me a reference to the passage in the canon where the Buddha describes the length of a kalpa? In the English Wikipedia article there is this quote which is allegedly by the Buddha: > "Were a man to take a piece of cloth of this most delicate texture [of > fine cotton], and therewith to touch in the slightest possible manner, > once in a hundred years, a solid rock, free from earth, a yojana [~14 > miles] high, and as much broad, the time would come when it would be > worn down, by this imperceptible trituration, to the size of a mung or > undu seed. This period would be immense in its duration; but it has > been declared by Buddha that it would not be equal to a Maha Kalpa." I would like to find that exact passage but alas no luck. I don't know where this could be. In the wiki article the sutta nipata is mentioned but I couldn't find anything in there. Thank you.