Hadithcore
Sahih al-Bukhari, 3146
sahih

Narrated Anas:

The Prophet (ﷺ) said, "I give to Quraish people in order to let them adhere to Islam, for they are near to their life of Ignorance (i.e. they have newly embraced Islam and it is still not strong in their hearts."

حَدَّثَنَا أَبُو الْوَلِيدِ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏

‏ إِنِّي أُعْطِي قُرَيْشًا أَتَأَلَّفُهُمْ، لأَنَّهُمْ حَدِيثُ عَهْدٍ بِجَاهِلِيَّةٍ ‏

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References2 variants
In-Book Reference
Book 57, Hadith 54
USC-MSA web (English) reference
Vol. 4, Book 53, Hadith 374 (deprecated numbering scheme)