Sony Alpha India 117

Having an amazing lens is just as important as the camera body itself. For weddings, you will want variety. You can get that with something as simple as a SEL 24-70mm F/2.8GM zoom lens, adopt a SEL50mmF/1.4GM prime or SEL35mmF/1.8 prime. Having a SEL70-200mmF/28GM on hand as well may be a lifesaver when the ceremony crowd is large and makes it difficult to get close enough.
However, even with one lens, you can leverage the environment and get creative with your lighting and composition.