Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates, Allah Almighty says: "By the witness and that which is witnessed." Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: "The witness means Sayyiduna Muhammad (peace and blessings be upon him), and that which is witnessed means the Day of Resurrection."
Al-Bazzar recorded it, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التفسير / 11482