Pooh and colleagues have a lot to say about being friends forever, but not this specific quote. It's like jewellery manufacturers have never heard of the American Psychological Association's style guide for correct referencing. For the record, at the beginning of "Pooh's Grand Adventure: The Search for Christopher Robin" (1997), some singing does occur with the lines "Forever isn't long at all when I'm with you" and "We could just be we; forever you and me" etc. Plus later there's the less uplifting line "I used to believe in forever; But forever's too good to be true". And in "A Very Merry Pooh Year" (2002) someone says "The important thing is that we're pals forever." And in "Pooh's Heffalump Halloween Move" (2005) there's a bit of "We're friends forever; we'll be brave forever" action. But as far as I can tell, no one at any point in any movie or book says: "We will be friends until forever, just you wait and see", although it is a popular misconception that this is an accurate Pooh quote.