Hadithcore
Sahih al-Bukhari, 4700
sahih

Narrated Ata:

When Ibn `Abbas heard:-- "Have you not seen those who have changed the favor of Allah into disbelief?" (14:28) he said, "Those were the disbelieving pagans of Mecca."

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ عَطَاءٍ، سَمِعَ ابْنَ عَبَّاسٍ، ‏{‏أَلَمْ تَرَ إِلَى الَّذِينَ بَدَّلُوا نِعْمَةَ اللَّهِ كُفْرًا‏}‏ قَالَ هُمْ كُفَّارُ أَهْلِ مَكَّةَ‏.‏

References2 variants
In-Book Reference
Book 65, Hadith 222
USC-MSA web (English) reference
Vol. 6, Book 60, Hadith 222 (deprecated numbering scheme)