The supplication of the Prophet (peace and blessings be upon him) for the tribes of Ghifar and Aslam

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The tribe of Ghifar, Allah has forgiven it; and the tribe of Aslam, Allah has granted it safety. Know that I did not say this on my own; rather, Allah Almighty said it."
This hadith has a sahih (authentic) chain, but the two Shaykhs did not record it with this addition. There is also another supporting narration (shahid) for this addition with a sahih chain.

Iyas bin Salamah bin al-Akwa' narrates from his father (Sayyiduna Salamah bin al-Akwa', may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) stood in prayer, he would supplicate against some tribes of the Arabs. He (peace and blessings be upon him) would say: "May Allah Almighty curse Ri'l, Dhakwan, Usayyah, which disobeyed Allah and His Messenger, and Banu Lihyan." And he (peace and blessings be upon him) would also say: "Ghifar, Allah has forgiven it; and Aslam, Allah has granted it safety. I did not say these words; rather, Allah, Mighty and Majestic, said them." Then, after supplicating against those he supplicated against, he (peace and blessings be upon him) would say Allahu Akbar.