مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1457
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated that Sa’d bin Abi Waqqas said: What is between the two lava fields of Madinah is a sanctuary. It was made a sanctuary by the Messenger of Allah (ﷺ) just as Makkah was made a sanctuary by Ibraheem. O Allah, make the blessing in it twofold and bless them in their sa"s and mudds (weights and measures).
Musnad Ahmad 1457Sahih, because of corroborating evidence, Muslim (1362,1387)