What is the ruling on dealing with two friends who have been in a dispute for more than three days, if one of them consistently refuses reconciliation, especially given that I have reminded the one refusing that his deeds will not be raised to Allah Almighty?

We advise you to continue reconciling them, as reconciliation between people is one of the best deeds, in accordance with the Almighty's saying: "There is no good in much of their private conversation, except for whoever enjoins charity or good or reconciliation between people. And whoever does that seeking means to the approval of Allah - then We will give him a great reward." Try to convince the one insisting on abandonment and show him its seriousness. Mention to him the texts of revelation concerning it, and seek the help of your other friends in influencing him.