مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4146
Musnad of Abdullah bin Mas'ood
It was narrated from 'Abdullah that The Prophet (ﷺ) said: “The best of the people are my generation, then those who come after them, then those who come after them. Then there will come people after them one of whose testimony will come before his oath and his oath will come before his testimony.
Musnad Ahmad 4173lts isnad is saheeh, Muslim (3533)]