Musnad Ahmad 30:3441

Yazid narrated to us, Mas'udi informed us, from Ash'ath ibn Sulaym, from his father, that Abu Hurayrah saw a man who had left the mosque after the call to prayer had been made in it. He said: "As for this one, he has disobeyed Abu al-Qasim, may Allah bless him and grant him peace."