Red String of Fate

When Madara was defeated, he finally realized how many regrets he had carried with him. His clan had used him as a weapon against the Senju, he was blinded with hatred and swore to take revenge for his brother, in the end he couldn't achieve anything. Madara's heart ached as he watched Hashirama approach him, at the moment of death he wished for many things.
He'd wished that he was not manipulated by hatred, he'd wished his brother hadn't died, he'd wished that he wasn't born in the Uchiha Clan, he'd wished that he and Hashirama could've stayed friends, or more.
He'd wished he could be rebirthed and live a peaceful life with Hashirama and Izuna by his side. God took pity and fulfilled some of his wishes.