مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3544
Musnad of Abdullah bin Mas'ood
It was narrated from 'Abdullah bin Mas'ood (رضي الله عنه) that The Prophet of Allah (ﷺ) said: "Prayer in congregation is twenty five times better than a man praying on his own, each time like his prayer."
Musnad Ahmad 3567Saheeh because of corroborating evidence; this is a da'eef i