Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: For a period of time we kept thinking and supposing that this verse had been revealed about us and about the People of the Book who were before us: (Allah Almighty says:) "Indeed, you will die and indeed, they will die; then on the Day of Resurrection you will dispute with one another before your Lord." We used to think: How will we dispute with one another, when our Prophet is one and our Book is one? Until we saw the situation in which people among us came against one another with swords; then I knew that this verse had been revealed about us.
Al-Tabarani recorded it, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التفسير / 11310