مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2738
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas (رضي الله عنه) that the Prophet (ﷺ) said: “If you have a dispute concerning the road, then make it seven cubits, then build, and if one neighbour asks another to let him use his wall (as a support), he should let him do so."
Musnad Ahmad 2757Saheeh because of corroborating evidence; this is a da'eef i