Sahih Muslim Book - 6, Hadith - 1636

وَحَدَّثَنِى أَبُو الرَّبِيعِ الزَّهْرَانِىُّ حَدَّثَنَا حَمَّادٌ عَنِ الزُّبَيْرِ بْنِ الْخِرِّيتِ عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ قَالَ خَطَبَنَا ابْنُ عَبَّاسٍ يَوْمًا بَعْدَ الْعَصْرِ حَتَّى غَرَبَتِ الشَّمْسُ وَبَدَتِ النُّجُومُ وَجَعَلَ النَّاسُ يَقُولُونَ الصَّلاَةَ الصَّلاَةَ - قَالَ - فَجَاءَهُ رَجُلٌ مِنْ بَنِى تَمِيمٍ لاَ يَفْتُرُ وَلاَ يَنْثَنِى الصَّلاَةَ الصَّلاَةَ. فَقَالَ ابْنُ عَبَّاسٍ أَتُعَلِّمُنِى بِالسُّنَّةِ لاَ أُمَّ لَكَ. ثُمَّ قَالَ رَأَيْتُ رَسُولَ اللَّهِ -صلى الله عليه وسلم- جَمَعَ بَيْنَ الظُّهْرِ وَالْعَصْرِ وَالْمَغْرِبِ وَالْعِشَاءِ. قَالَ عَبْدُ اللَّهِ بْنُ شَقِيقٍ فَحَاكَ فِى صَدْرِى مِنْ ذَلِكَ شَىْءٌ فَأَتَيْتُ أَبَا هُرَيْرَةَ فَسَأَلْتُهُ فَصَدَّقَ مَقَالَتَهُ.

It was narrated that 'Abdullah bin Shaqiq said: "Ibn 'Abbas addressed us one day after 'Asr until the sun set and the stars appeared, and the people started saying: 'Prayer, prayer.' Then a man from Banu Tamim came to him and he persisted in saying: 'Prayer, prayer.' Ibn 'Abbas said: 'Are you teaching me the Sunnah? May you be bereft of your mother!' Then he said: 'I saw the Messenger of Allah (s.a.w) joining Zuhr with 'Asr, and Maghrib with 'Isha'."' Ibn Shaqiq said: "I had some doubt about that, so I went to Abu Hurairah and asked him, and he confirmed what he had said."