Sayyiduna Ammar (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "The example of my Ummah is like rain: Allah Almighty has placed goodness in its first part, and He has placed goodness in its last part as well."
Al-Tabarani recorded it; its chain contains Musa bin Ubaydah al-Rabadhi, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16707