Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: "I was riding behind the Messenger of Allah (peace and blessings be upon him), and he said: 'O my son! Guard (the rights of) Allah, and Allah will guard you. Be mindful of Allah, and you will find Him before you. When you ask, ask Allah alone, and when you seek help, seek help from Allah alone. The pages have dried and the pens have been lifted (after writing the decree). If the whole Ummah strove to benefit you with something that Allah has not decreed for you, they would not be able to do so; and if the whole Ummah strove to harm you with something that Allah has not decreed against you, it would not be able to do so.'"
Imam al-Tabarani (may Allah have mercy on him) said: "It is said that Abu Amr, from whom Ishaq al-Azraq narrated this hadith, is Abu Amr bin al-Ala'; and Allah knows best. No one narrated this hadith from Abu Amr except Ishaq al-Azraq."
Hadith Referenceالمعجم الأوسط / باب الميم / 5417
Hadith Takhrij«أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 12، 13، 14، 15، 109، والحاكم فى «المستدرك» برقم: 6359، 6360، والترمذي فى «جامعه» برقم: 2516، وأحمد فى «مسنده» برقم: 2713، 2807، 2848، 2849، وأبو يعلى فى «مسنده» برقم: 2556، وعبد بن حميد فى «مسنده» برقم: 636، والطبراني فى «الكبير» برقم: 11243، 11416، 11560، 12988، 12989»