11. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Abd Allah ibn Muhammad al-Hajjal from Tha’labah ibn Maymun from ‘Imran ibn Ali al-Halabiy who has said the following:

“I once asked abu ‘Abd Allah , about when al-‘Atmah (al-‘Isha’) becomes obligatory? He (the Imam) said, ‘When al-Shafaq (redness) disappears. Al-Shafaq is the redness.’ ‘Ubayd Allah then said, ‘I pray to Allah to keep you well, after the disappearance of redness there remains a strong light visible.’ Abu ‘Abd Allah , said, ‘Brightness (al-Shafaq) is the redness and light (or rays) are not from al-Shafaq.’”