مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4234
Musnad of Abdullah bin Mas'ood
It was narrated that 'Abdullah said: The Prophet (ﷺ) said: “Trading insults with a Muslim is an evil action and fighting him is kufr. And the sanctity of his wealth is like the sanctity of his blood.”
Musnad Ahmad 4262Scheeh and its isnad is da’eef]