كتاب الزهد
Read the English translation first, with the original Arabic directly underneath.
(Abu) Khalid Al-Walibi narrated from Abu Hurairah and he (one of the narrators) said:
“I do not know except that he attributed it to the Prophet (ﷺ)” – “Allah says: ‘O son of Adam, devote yourself to My worship, and I will fill your heart with contentment and take care of your poverty; but if you do not do that, then I will fill your heart with worldly concerns and will not take care of your poverty.’”
يَقُولُ اللَّهُ سُبْحَانَهُ يَا ابْنَ آدَمَ تَفَرَّغْ لِعِبَادَتِي أَمْلأْ صَدْرَكَ غِنًى وَأَسُدَّ فَقْرَكَ وَإِنْ لَمْ تَفْعَلْ مَلأْتُ صَدْرَكَ شُغْلاً وَلَمْ أَسُدَّ فَقْرَكَ