مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1788
Musnad Bani Hashim (Hadeeth of al-'Abbas bin 'Abdul-Muttalib from the Prophet)
It was narrated that ‘Abbas bin "Abdul-MuttaIib said: O Messenger of Allah, have you benefited your uncle Abu Talib in any way? For he used to protect you and stand up for you. He said: "Yes; he is in the shallowest part of Hell; were it not for me he would be in the lowest depth of Hell."
Musnad Ahmad 1789Sahih (Darussalam) [ al-Bukhari (3883) and Muslim (209)]