which is not an "is" statement so cannot be the bridge from is to ought, because the question then becomes how 
that was derived. And whether that is a moral absolute, since 
@Bradskii denies that such absolutes exist.
		
 
		
	 
I can start here.
'Do unto others...' is a suggestion as to how one should live a valued life. It's been common throughout the ages. From Egypt and India, Greek and Roman, Christianity...all major religions and philosophies have their version. Earlier you said that Jesus has your moral answers (a matter I'll address later), so I'm certain that you agree with it. To the extent that it is a fact of life.
To expand on that...
I don't want to get smacked in the mouth. If I hit you then there's an excellent chance that you'll retaliate. So hey, that Golden Rule comes in handy. It is a fact that if I don't interfere with your well being then you are not going to interfere with mine. I'm treating you as I would like to be treated.
I also like living in a relatively peaceful society in general. My family is reasonably safe in the one in which we live. There is a social contact to which we (mostly) adhere which keeps things on an even keel. If smacking people in the mouth at random were to be the norm then that social contract dissolves. Violence would increase. Theft would increase. People would start thinking that hey, if he can do what he wants then so can I. Golden Rule again.
Add to this the fact that I don't like to see people in pain. That's empathy
 allowing me to understand what they are feeling. Empathy is not an emotion. It allows you to understand someone 
else's emotional state. What I feel about it may vary. I may be distraught. I may be happy. I may be indifferent. Yes, all feelings. But I can't change them. I can't decide to be happy when I see a child being hurt. I can't decide to be indifferent if my daughter is depressed. And you can also add to that that I (mostly) don't like causing pain (the last fight I had was in school and as soon as I punched the guy (he deserved it) I was immediately concerned that he'd been hurt).
So, what have we got here. Lots of facts. You've been smacked in the mouth. That IS a fact. You may well retaliate. That IS a strong possibility. I don't want to be hit. That IS another fact. I like living in a world where this sort of violence doesn't happen. That IS yet another fact. It IS a feature of my character that I don't like hurting people. It IS also a characteristic that I don't like to see people hurt.
So all these IS statements keep adding up. To a point where we OUGHT to do something to prevent all these non desireable outcomes. So if smacking you in the mouth IS going to cause all these problems then I OUGHT not to do it.
Now what I have given you are some facts why I OUGHT not to do it. And one way you may address it is by saying that some of those weren't facts but emotions. But we can't help our emotions. They spring unbidden into our lives. We're not Spock cooly and calmly determining consequences. Neither of us. Our emotions are simply facts of our characteristics. Built into our DNA. And mine come from an extremely long line of ancestors who felt roughly the same. As did yours. They come from a line of ancestors that managed to keep procreating through time until we arrived. And through an evolutionary dice toss they were generally the ones that thought that living in a society where people (mostly) didn't randomly attack each other was a better way of living. And so we think that way. You can't think any other way. It IS a fact.
So we OUGHT to live like that.