مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1951
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
Qatadah said: I heard Jabir bin Zaid narrate that Ibn "Abbas said: The daughter of Hamzah was mentioned to the Prophet (ﷺ) (as a potential bride) but he said: "She is the daughter of my brother through breastfeeding.”
Musnad Ahmad 1952Sahih (Darussalam) [ al-Bukhari (2645) and Muslim (1447)]