مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1782
Musnad Bani Hashim (Hadeeth of al-'Abbas bin 'Abdul-Muttalib from the Prophet)
It was narrated that al-"Abbas said: I came to the Messenger of Allah (ﷺ) and said: O Messenger of Allah, teach me something that I may say in my supplication. He said: "Ask Allah for pardon and well being." Then I came to him another time and said: O Messenger of Allah, teach me something that I may say in my supplication. He said: “O "Abbas, O uncle of the Messenger of Allah (ﷺ), ask Allah for wellbeing in this world and in the Hereafter.”
Musnad Ahmad 1783Hasan because of corroborating evidence; this is a da'eef is