مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2096
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: "If you have a dispute concerning the road, then make it seven cubits, and whoever builds a structure let him support it with his neighbour's wall.”
Musnad Ahmad 2098Saheeh because of corroborating evidence, this is a da'eef i