question #1 Sahih Muslim 679b, Book 5, Hadith 391 : What is the significance of Allah’s pardon and protection for certain tribes in Islamic teachings?

So far as the tribe of Ghifar is concerned, Allah had pardoned it, and Allah had granted protection to the tribe of Aslam, and as for the tribe of Usayya, It had disobeyed Allah and His Messenger, (and further said): O Allah! curse the tribe of Lihyan curse Ri’l, and Dhakwan, and then fell in prostration. It is after this that the cursing of the unbelievers got a sanction.