Is there anyway to refer to the previous selected sheet in a macro?

In other words, the macro is designed on a sheet named "Master" and
switches back and forth between that sheet and another, lets call it
"Output".

"Master" is designed to be copied and renamed, but it always references
"Output" in certain macros.

The code currently begins on "Master" and goes something like this:

Range("A1:A10").Copy
Sheets("Output").Select
Range("A1:A10").Paste
Sheets("Master").Select
....and so on.

I need that same functionality if "Master" is named "Master2" or
"AbeVigoda" or whatever. Does VBA include syntax for Previous Sheet or
Last sheet or anything so that you can tell the macro to go back to
sheet it started from?

Thanks to all.