Time, space, and matter had beginnings. They actually share one beginning: The Big Bang.
With that initial launch, into what did time, space, and material expand? It can’t be anything of time, space, and material, and it wasn’t no thing (i.e., nothing).
The Big Bang did not blast into time, space, and material. For that to happen, the created would need to exist before its creation – a logical and practical impossibility.
The stuff of The Big Bang had to expand into some thing. No thing is not some thing. So, the stuff of The Big Bang did not expand into nothing.
Into what did The Big Band expand?