Ibn 'Abbas one day addressed us in the afternoon (after the afternoon prayer) till the sun disappeared and the stars appeared, and the people began to say: Prayer, prayer. A person from Banu Tamim came there. He neither slackened nor turned away, but (continued crying): Prayer, prayer. Ibn 'Abbas said: May you be deprived of your mother, do you teach me Sunnah? And then he said: I saw the Messenger of Allah ﷺ combining the noon and afternoon prayers and the sunset and 'Isha' prayers. 'Abdullah b. Shaqiq said: Some doubt was created in my mind about it. So I came to Abu Huraira and asked him (about it) and he testified his assertion. (Using translation from Muslim 705g)   

فَجَاءَهُ رَجُلٌ مِنْ بَنِي تَمِيمٍ لَا يَفْتُرُ الصَّلَاةَ الصَّلَاةَ فَقَالَ أَتُعَلِّمُنِي السُّنَّةَ لَا أُمَّ لَكَ ثُمَّ قَالَ رَأَيْتُ رَسُولَ اللهِ ﷺ يَجْمَعُ بَيْنَ الظُّهْرِ وَالْعَصْرِ وَالْمَغْرِبِ وَالْعِشَاءِ قَالَ عَبْدُ اللهِ بْنُ شَقِيقٍ فَحَاكَ فِي صَدْرِي مِنْ ذَلِكَ شَيْءٌ فَأَتَيْتُ أَبَا هُرَيْرَةَ فَسَأَلْتُهُ فَصَدَّقَ مَقَالَتَهُ