Ibn Abi Shaybah from al-Fadl bin Dakeen from Zuhayr from Abu Ishaq from Abu al-AhwaS from 'Abdullah and 'Affan from Humad bin Salamah from Hameed from al-Hassan and it is from Suffiyan al-Thawri and ibn al-Mubarak and Marwan ibn Mu'awiyah from 'Awf al-A'arabi from Sa'eed ibn abi al-Hassan that 'Abdullah ibn 'Abbas (ra) says: "He who leaves three consecutive Fridays; he has discarded Islam behind his back."