Abu Umamah bin Tha'labah (May Allah be pleased with him) reported:
The Companions of Messenger of Allah (ﷺ) mentioned the life of the world before him. He (ﷺ) said, "Do you not hear? Do you not hear? Simplicity (in life) is part of Faith, simplicity is part of Faith."[Abu Dawud]. (DE)
Arabic/English book reference (DE): Book 1, Hadith 517 (DE)