How you do this depends on the type of TextBox you have.
If you have an ActiveX TextBox embedded in a worksheet, you can use the LinkedCell Property of the TextBox to display the value of the cell.
If you have a Form Control TextBox embedded in a worksheet, you can select it, then enter a reference to the cell you want to link into the formula bar. For example: =A1
Neither of those links requires VBA to be enabled, however you won't have much of the normal functionality of the objects if VBA is not enabled.