Sayyiduna Abu al-Darda' (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said to his Companions: "When Allah Almighty took Sayyiduna Dawud in death, those people did not fall into trial, nor did they make any change (in their religion). Likewise the followers of Sayyiduna al-Masih (peace be upon him) remained on his guidance and his Sunnah for two hundred years."
Al-Bazzar recorded it, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب العلم / 921