Hadithcore
Mishkat al-Masabih, 1856

'Umar said, "You people must know that covetousness is poverty, despair is wealth, and that when a man despairs of anything he can dispense with it.”. Razin transmitted it.

وَعَن عمر رَضِي الله عَنهُ قَالَ: تَعْلَمُنَّ أَيُّهَا النَّاسُ أَنَّ الطَّمَعَ فَقْرٌ وَأَنَّ الْإِيَاسَ غِنًى وَأَنَّ الْمَرْءَ إِذَا يَئِسَ عَن شَيْء اسْتغنى عَنهُ. رَوَاهُ رزين

References1 variant
In-Book Reference
Book 6, Hadith 83