مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3655
Musnad of Abdullah bin Mas'ood
A similar report was narrated from Ibraheem bin Muslim Abu Ishaq al-Hajari, and he said: "Adam will say: O Lord, how many shall I send?”
Musnad Ahmad 3678Saheeh because of corroborating evidence and it is a da'eef