Sayyiduna Imran bin Husayn (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "The example of my Ummah is like rain: it is not known whether its first part is better, or its last part."
Al-Bazzar recorded it, and al-Tabarani in al-Mu'jam al-Awsat; the chain of al-Bazzar is hasan (good). He (al-Bazzar) said: It has not been narrated from the Prophet (peace and blessings be upon him) with a better chain than this.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16708