مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1489
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated that Sa’d said: Make a lahd (niche) for me and block it up with bricks as was done for the Messenger of Allah (ﷺ).
Musnad Ahmad 1489Sahih (Darussalam), Muslim (966)]