Sunan an-Nasa'i 1988

أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا مُحَمَّدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ طَلْحَةَ بْنِ عَبْدِ اللَّهِ، قَالَ صَلَّيْتُ خَلْفَ ابْنِ عَبَّاسٍ عَلَى جَنَازَةٍ فَسَمِعْتُهُ يَقْرَأُ، بِفَاتِحَةِ الْكِتَابِ فَلَمَّا انْصَرَفَ أَخَذْتُ بِيَدِهِ فَسَأَلْتُهُ فَقُلْتُ تَقْرَأُ قَالَ نَعَمْ إِنَّهُ حَقٌّ وَسُنَّةٌ ‏.‏

It was narrated that Talhah bin 'Abdullah said:"I offered the funeral prayer behind Ibn 'Abbas and I heard him reciting Fatihat Al-Kitab. When he finished I took him by the hand and asked him. 'Did you recite?' He said: 'Yes, it is the truth and the Sunnah

Reference

Sunan an-Nasa'i 1988

In-book

Book 21, Hadith 171