It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "The safeguard of the earth from drowning is the (heavenly) bow, and the safeguard of my Ummah from division and discord is loyalty to Quraysh; Quraysh are the people of Allah." He (peace and blessings be upon him) said this three times. "So when any tribe of the Arabs opposes them, they will become the party of Iblis."
No one narrated this hadith from Ata (may Allah have mercy on him) except Khulayd bin Da'laj (may Allah have mercy on him), and Ishaq bin Sa'id (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الميم / 6709
Hadith Gradingمحدثین:إسناده ضعيف لضعف خليد بن دعلج
Hadith Takhrij«قال الهيثمي: فيه خليد بن دعلج وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 5، ص 195»» «أخرجه الحاكم فى «المستدرك» برقم: 4740، 7051، والطبراني فى «الكبير» برقم: 11479، والطبراني فى «الأوسط» برقم: 743»