The Messenger of Allah ﷺ said, "No person truly believes until he believes in divine decree, both its good and its evil."
أن رسول الله ﷺ قال: لا يؤمن المرأ حتى يؤمن بالقدر خيره وشره.
Imam Ahmad narrated it (6703) from Anas bin Iyad, who said, Abu Hazim narrated to us, from Amr bin Shuayb, from his father, from his grandfather, mentioning the same. Its chain is hasan on account of Amr bin Shuayb. Ibn Abu Asim also related it in Sunnah (134) from Yaqub bin Humayd, who said, Ibn Abu Hazim and Anas bin Iyad narrated to us, from Abu Hazim, mentioning it with his chain, the same. Firyabi related it in Qadar (203, 204), and Bayhaqi in Qadar wal-Qada (2/421), through routes from Abu Hazim, with his chain, the same.This hadith has other routes from Amr bin Shuayb, from his father, from his grandfather, but what I have mentioned is the soundest of them. There is also, on this subject, a report from Abdullah bin Amr as a saying of the Prophet, "No nation was ever destroyed except through shirk against Allah, and the beginning of their shirk was nothing but denial of divine decree." Ibn Abu Asim related it in Sunnah (322), and Bayhaqi in Qadar wal-Qada (2/683), both from the hadith of Muhammad bin Shuayb bin Shabur, who said, Umar bin Yazid Basri informed me, from Amr bin Muhajir, from Umar bin Abdul-Aziz, from Yahya bin Qasim bin Abdullah bin Amr bin As bin Waail Sahmi, from his father, from his grandfather, from the Messenger of Allah ﷺ, mentioning the same.Yahya bin Qasim and his father are unknown, even though Ibn Hibban mentioned them in Thiqat, following his usual practice of affirming the reliability of unknown narrators. As for Umar bin Yazid Basri, or Nasri, Ibn Hibban said of him in Majruhin (644), "He was among those who would invert chains of transmission and elevate disconnected reports to connected ones. He may not be relied upon at all, though if something he reports is corroborated by reliable narrators, there is no harm in considering it." I say, I did not find, among what he reported, anything corroborated by reliable narrators.Likewise, what is reported from Anas bin Malik as a saying of the Prophet, "Three things are part of the foundation of faith. Restraining oneself from anyone who says there is no god but Allah, not declaring him an unbeliever for a sin, and not expelling him from Islam for an action. Jihad continues from the time He sent me until the last of my nation fights the Dajjal, and it is not nullified by the injustice of an unjust ruler nor the justice of a just one. And faith in divine decrees." Abu Dawud related it (2532) from Saeed bin Mansur, who said, Abu Muawiya narrated to us, who said, Jafar bin Barqan narrated to us, from Yazid bin Abu Nashba, from Anas bin Malik, mentioning the same. Bayhaqi related it from him in Qadar wal-Qada (2/421–422).Its chain is daif on account of Yazid bin Abu Nashba, Sulami, with the nun vowelled with a damma and the dotted letter carrying a sukun, for he is "unknown" as Hafiz said in Taqrib.