Sayyiduna Utbah bin Abd (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) said: "The caliphate will be in Quraysh." After this the narrator mentioned the full hadith, which has already passed earlier at the beginning of the Book of Rulings (Kitab al-Ahkam).
Ahmad and al-Tabarani recorded it. The narrators of Ahmad are thiqat (trustworthy). The hadith reported from Sayyiduna Abu Hurayrah (may Allah be pleased with him) has already passed, and its narrators are also thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الخلافة / 8996