This theme is mentioned in the Quran couple of times. This theme is talking about how bountiful Allah is and that he gives without measure and without decreasing anything from His vast Kingdom.
Allah says in sura Al Baqara (The Cow) Verse 212
٢١٢ زُيِّنَ لِلَّذِينَ كَفَرُوا الْحَيَاةُ الدُّنْيَا وَيَسْخَرُونَ مِنَ الَّذِينَ آمَنُوا ۘ وَالَّذِينَ اتَّقَوْا فَوْقَهُمْ يَوْمَ الْقِيَامَةِ ۗ وَاللَّهُ يَرْزُقُ مَنْ يَشَاءُ بِغَيْرِ حِسَابٍ
Beautified is the life of this world for those who disbelieve, and they ridicule those who believe. But the righteous will be above them on the Day of Resurrection. God provides to whomever He wills without measure.
Allah says in Sura Al Imran (The Family of Imran) Verse 27
٢٧ تُولِجُ اللَّيْلَ فِي النَّهَارِ وَتُولِجُ النَّهَارَ فِي اللَّيْلِ ۖ وَتُخْرِجُ الْحَيَّ مِنَ الْمَيِّتِ وَتُخْرِجُ الْمَيِّتَ مِنَ الْحَيِّ ۖ وَتَرْزُقُ مَنْ تَشَاءُ بِغَيْرِ حِسَابٍ
“You merge the night into the day, and You merge the day into the night; and you bring the living out of the dead, and You bring the dead out of the living; and You provide for whom you will without measure.”
Allah says in Sura Al Imran (The Family of Imran) Verse 37
٣٧ فَتَقَبَّلَهَا رَبُّهَا بِقَبُولٍ حَسَنٍ وَأَنْبَتَهَا نَبَاتًا حَسَنًا وَكَفَّلَهَا زَكَرِيَّا ۖ كُلَّمَا دَخَلَ عَلَيْهَا زَكَرِيَّا الْمِحْرَابَ وَجَدَ عِنْدَهَا رِزْقًا ۖ قَالَ يَا مَرْيَمُ أَنَّىٰ لَكِ هَٰذَا ۖ قَالَتْ هُوَ مِنْ عِنْدِ اللَّهِ ۖ إِنَّ اللَّهَ يَرْزُقُ مَنْ يَشَاءُ بِغَيْرِ حِسَابٍ
Her Lord accepted her with a gracious reception, and brought her a beautiful upbringing, and entrusted her to the care of Zechariah. Whenever Zechariah entered upon her in the sanctuary, he found her with provision. He said, “O Mary, where did you get this from?” She said, “It is from God; God provides to whom He wills without reckoning.”
Allah also says in Sura Nur (Light) Verse 38
٣٨ لِيَجْزِيَهُمُ اللَّهُ أَحْسَنَ مَا عَمِلُوا وَيَزِيدَهُمْ مِنْ فَضْلِهِ ۗ وَاللَّهُ يَرْزُقُ مَنْ يَشَاءُ بِغَيْرِ حِسَابٍ
God will reward them according to the best of what they did, and He will increase them from His bounty. God provides for whomever He wills without reckoning.
The fact that Allah is able to provide and give without measure tells the fact that Allah is very Rich and in fact, Al Ghaniyu (The Most Rich) and Al Mughniyu (The Enricher) are among the names of Allah.