حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، أَنْبَأَنَا عَبَّادُ بْنُ الْعَوَّامِ، عَنْ عُمَرَ بْنِ إِبْرَاهِيمَ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنِ الأَحْنَفِ بْنِ قَيْسٍ، عَنِ الْعَبَّاسِ بْنِ عَبْدِ الْمُطَّلِبِ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ لاَ تَزَالُ أُمَّتِي عَلَى الْفِطْرَةِ مَا لَمْ يُؤَخِّرُوا الْمَغْرِبَ حَتَّى تَشْتَبِكَ النُّجُومُ ‏"‏ ‏.‏ قَالَ أَبُو عَبْدِ اللَّهِ بْنُ مَاجَهْ سَمِعْتُ مُحَمَّدَ بْنَ يَحْيَى يَقُولُ اضْطَرَبَ النَّاسُ فِي هَذَا الْحَدِيثِ بِبَغْدَادَ فَذَهَبْتُ أَنَا وَأَبُو بَكْرٍ الأَعْيَنُ إِلَى الْعَوَّامِ بْنِ عَبَّادِ بْنِ الْعَوَّامِ فَأَخْرَجَ إِلَيْنَا أَصْلَ أَبِيهِ فَإِذَا الْحَدِيثُ فِيهِ ‏.‏

It was narrated that 'Abbas bin 'Abdul-Muttalib said: "The Messenger of Allah said: 'My Ummah will continue to adhere to the Fitrah so long as they do not delay the Maghrib until the stars have come out." (Hasan)Abu 'Abdullah bin Majah said: I heard Muhammed bin Yahya saying: 'The people in Baghdad were confused in narrating this Hadith. Abu Bakr Al-A'yan and I went to 'Awwam bin 'Abbad bin 'Awwam and he brought out to us the book of his father, and this Hadith was in it.'" Translation Not Available

Book reference: Sunan Ibn Majah Book 2 Hadith 689
Web reference: Sunan Ibn Majah Volume 1 Book 2 Hadith 689