مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1877
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas that the Messenger of Allah (ﷺ) forbade a man to be married to a paternal aunt and a maternal aunt(i.e., one is the paternal aunt of the other, who is her maternal aunt.) at the same time, or two paternal aunts [i.e., they are aunts of one another], or two maternal aunts.
Musnad Ahmad 1878Da'if (Darussalam) [] [1]