مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3693
Musnad of Abdullah bin Mas'ood
It was narrated that 'Abdullah (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: They kept us from offering the middle prayer until the sun set; may Allah fill their bellies and their graves with fire.”
Musnad Ahmad 3716A saheeh hadeeth]