Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:11105a –
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السيوطي:١١١٠٥a –

"الشَّفَقُ الحُمْرَةُ، فإِذَا غَابَ الشَّفَقُ وَجَبَتِ الصَّلاةُ".  

[قط] الدارقطنى في السنن عن ابن عمر، وقال في الغرائب: غريبٌ، وكل رواته ثقاتٌ، وقال الحاكم والبيهقي: الصحيحُ وَقْفُهُ على ابن عمر

See similar narrations below:

Collected by Bayhaqī
bayhaqi:1744 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū Bakr b. Isḥāq al-Faqīh > ʿAbd al-ʿAzīz b. Muḥammad > ʿAlī b. ʿAbd al-Ṣamad > Hārūn b. Sufyān > ʿAtīq b. Yaʿqūb b. Ṣiddīq > Mālik > Nāfiʿ > Ibn ʿUmar

[Machine] The Messenger of Allah ﷺ said, "Redness on the horizon is the dawn, and when the redness disappears, it is time for the prayer."  

البيهقي:١٧٤٤ – وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أنا أَبُو بَكْرِ بْنُ إِسْحَاقَ الْفَقِيهُ أنا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ ثنا عَلِيُّ بْنُ عَبْدِ الصَّمَدِ ثنا هَارُونُ بْنُ سُفْيَانَ عَنْ عَتِيقِ بْنِ يَعْقُوبَ بْنِ صِدِّيقٍ عَنْ مَالِكٍ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ الشَّفَقُ الْحُمْرَةُ فَإِذَا غَابَ الشَّفَقُ وَجَبَتِ الصَّلَاةُ