The supplication of the Prophet (peace and blessings be upon him) for al-Abbas (may Allah be pleased with him) and his children

It is narrated from Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) set out (on a journey) in the season of intense heat and camped at a place. Then the Messenger of Allah (peace and blessings be upon him) stood up to take a bath, and Sayyiduna al-Abbas bin Abd al-Muttalib (may Allah be pleased with him) screened him (peace and blessings be upon him) with a woollen sheet. Sahl says: I looked at the Messenger of Allah (peace and blessings be upon him) from one side of the sheet; he (peace and blessings be upon him) had raised his blessed head towards the sky and was supplicating: 'Allahumma-stur al-Abbasa wa waladahu min an-nar' (O Allah, screen al-Abbas and his children from the Fire (of Hell)).
This hadith has a sahih (authentic) chain of transmission, but the two Shaykhs did not record it.

It is narrated from Sayyiduna Abdullah bin Harithah (may Allah be pleased with him) that he said: When Safwan bin Umayyah bin Khalaf al-Jumahi came, the Messenger of Allah (peace and blessings be upon him) asked him: "O Abu Wahb, with whom are you staying?" He said: With al-Abbas (may Allah be pleased with him). He (peace and blessings be upon him) said: "You are staying with the man of Quraysh who loves Quraysh the most."
This hadith has a sahih (authentic) chain of transmission, but the two Shaykhs did not record it.