Takhrij Hadith 1458: "Narrated from Ibn 'Abbas, regarding…"

Narrated from Ibn 'Abbas, regarding the words of Allah: {O you who believe, fear Allah and give up what remains of usury} up to {then be informed of a war from Allah and His Messenger}: "Whoever persists in [dealing with] usury and does not desist from it, then it is a duty upon the leader of the Muslims to ask him to repent; if he desists, [he is spared], but if not, he should have his neck struck [i.e., he is executed]."