Ka'b bin 'Iyad (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) said, "Verily, there is a Fitnah (trial) for every nation and the trial for my nation (or Ummah) is wealth."[At- Tirmidhi]. (RU)
Arabic/English book reference (RU): Book 1, Hadith 481 (RU)