Sayyidina Ibn Abbas (RA) reported that he heard Umar ibn Khattab say: “When Abdullah ibn Ubayy died, Allah’s Messenger (ﷺ) was invited to lead his funeral salah. So, he stood up to go and consented to it, intending the salah, I intervened till I stood directly opposite him and I said, “O Messenger (ﷺ) of Allah, over the enemy of Allah, Abdullah ibn Ubbayy who said on such-and-such day this and that, this and that?” and I counted his days. Allah’s Messenger (ﷺ) smiled till I exceeded much. He said, “Move away from me, 0Umar. I have been given choice, so I have chosen. It has been said to me: "Ask pardon for them or do not ask pardon for them-even if you ask pardon for them seventy times, Allah shall never pardon them." (9:80) And if I knew that exceeding over seventy would get him pardon them I would exceeed that.’ Then he prayed his funeral salah. Then he walked with the funeral and stood at his grave till it was over. I was surprised at my daring, but Allah and His Messenger (ﷺ) know better. By Allah, it was not easy till these two verses were revealed: "And never offer a prayer on any one of them who dies, and do not stand by his grave." (9: 84) [Ahmed 95, Bukhari 1366, Nisai 1965] --------------------------------------------------------------------------------