Multiple Selves Sutta reference?

Wondering if anyone knows the sutta where the Buddha talks about the aggregates and multiple selves. As in there is a changing group of khandas, and in one moment there is a self, (which could be called a self though it is fleeting) and another moment another self. (But its so fleeting it can hardly be called a Higher Self or Soul ect, as its only momentary). Its been about 6 years since I read the sutta, but I did find it, I am not explaining very well. It is quite short and direct. This is not talking about just the body as a self, its talking about the fleeting moment of the four or five aggregates (khandas). I know the simile that will likely be quoted but this was a more obscure reference. Some groups use this reference to refer to the "billions of selves". I am sure it exists in one place probably the Connected Discourses. Blessings in the Buddha Dhamma