Is there a formula that will show what the contents of another cell is.

Example

A1 =(B1)
The Value of B1 is 'Test'
Therefore the value of A1 is 'Test'

However if I were to drag Cell B1 to, lets say, C1
The formula in A1 would automatically change to =(C1) and the value would
remain 'Test'.

I want it so the formula in A1 stays as =(B1), no matter if I move the cell

Is this possible?

Many Thanks