Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "A servant is not a believer until he believes in destiny (qadar)."
Al-Tabarani recorded it; its chain contains a narrator, Isma'il bin Abi al-Hakam al-Thaqafi, whom I do not know, and the rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب القدر / 11882
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (5900) ، أخرجه المعجم الكبير للطبراني برقم: 5900»