مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1450
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated from ‘Amir bin Sa"d, that Sa"d (رضي الله عنه) said: Make a lahd (niche) for me and block it up with bricks as was done for the Messenger of Allah.
Musnad Ahmad 1450Sahih (Darussalam), Muslim (966)]