Option Explicit
Sub John()
Dim ws As Worksheet, s1 As Worksheet
Set s1 = Sheets("Master") 'Create this sheet before running the macro
Dim lr As Long
For Each ws In Worksheets
If ws.Name <> "Master" Then
ws.Range("A1").CurrentRegion.Copy
lr = s1.Range("A" & Rows.Count).End(xlUp).Row
s1.Range("A" & lr + 1).PasteSpecial xlPasteValues
End If
Next ws
End Sub