Rasulullah (sallallahu ‘alayhi wa sallam) told Sayyiduna Mu’adh ibn Jabal (radiyallahu ‘anhu) when sending him to Yemen, “Abstain from opulence, for certainly the servants of Allah are not from among the opulent” (Musnad Ahmad, vol. 5 pg. 243 and Shu’abul Iman, Hadith: 5766)