All I'm eluding to here, is that @Tree of Life asserts that if we move away from any Biblical moral pronouncement or prescription, we are either ignorance, selfish, or evil. Do you agree with him?
If you do, then maybe we can address one of these 'moral absolutes', for which society has abandoned?
And also, has it been abandoned because much of society is ignorant, selfish, or wicked, or is it for another "reason(s)"?
I'd say it happens for a combination of many different reasons, not all of which would neatly fall under the umbrella of ignorance, selfishness, or wickedness.
What'za got? Give me, what you feel, is an absolute moral action or duty, (which might include a moral pronouncement society has since abandoned), and then prove it?
I don't think you can, using any means you have available to you. Not even if you use your favorite and most seemingly obvious "agreed upon' moral action or duty
I've been talking about objectivism, not absolutism. They're related, but not actually the same thing.
That said, I asked first. What exactly are you asking for when you're asking me for proof? What is it you're looking for? You want me to somehow "prove" moral absolutism right here, right now, in a CF forum post, like it's some kind of basic math problem? I mean, one example of an absolutist moral and ethical system would be the moral theory Kant constructed around the categorical imperative. The man wrote entire books expounding upon his views on morality. (not a Kantian myself, but it works as an example) If you were actually interested in exploring those ideas and the logic behind such a position, you'd probably look into those works in some way rather than coming in here and telling people to "prove it" over and over.
And lest I be accused of a "just go read about it" cop-out, the reason I say all this is because the very next thing you said, after asking me for my argument, my proof, my thoughts, whatever, is to tell me that you don't think I actually can prove anything (without even telling me what "proof" would consist of!),
regardless of the method or example I might use. That sort of thing reeks of approaching the entire discussion in bad faith. Maybe that wasn't your intent, but it certainly comes off that way.
By way of comparison, imagine you were part of a debate about evolution with a Young Earth Creationist who says to you "Oh yeah? Show an example of evolution being real and prove it. I bet you can't no matter what it is, since it's probably just evidence and theory and speculation but not actual proof.

"
Would you be inclined to seriously engage with that person, or would you perhaps think that person was approaching the entire discussion in bad faith?