Surah Saba 34:39

قُلْ إِنَّ رَبِّى يَبْسُطُ ٱلرِّزْقَ لِمَن يَشَآءُ مِنْ عِبَادِهِۦ وَيَقْدِرُ لَهُۥ ۚ وَمَآ أَنفَقْتُم مِّن شَىْءٍ فَهُوَ يُخْلِفُهُۥ ۖ وَهُوَ خَيْرُ ٱلرَّٰزِقِينَ

Say, "Indeed, my Lord extends provision for whom He wills of His servants and restricts [it] for him. But whatever thing you spend [in His cause] - He will compensate it; and He is the best of providers."

Translation: Saheeh International

Tafsir

Say ‘My Lord extends provision He makes it abundant for whomever He will of His servants as a test and restricts it for him after having extended it — or He restricts it for him whom He will to try and whatever thing you may expend for the cause of good He will replace it. And He is the best of providers’. …

Excerpt from Tafsir al-Jalalayn, commentary on 34:39, via Quran.com. The reader has the full commentary and 9 more tafsirs.