On the authority of Abu Umamah (may Allah be pleased with him), who said that the Messenger of Allah (PBUH) said: Allah (mighty and sublime be He) said: Truly of those devoted to Me the one I most favor is a believer who is of meager means and much given to prayer, who has been particular in the worship of his Lord and has obeyed Him inwardly (1), who was obscure among people and not pointed out, and whose sustenance was just sufficient to provide for him yet he bore this patiently. Then the Prophet (PBUH) rapped his hand and said: Death will have come early to him, his mourners will have been few, his estate scant.
(1) i.e. he has not been ostentatious in his obedience.
It was related by at-Tirmidhi (also by Ahmad ibn Hanbal and Ibn Majah). Its chain of authorities is sound.