"I heard the Messenger of Allah say: 'Allah, the Mighty and Sublime, does not accept prayer without purification or charity from Ghulul." (Using translation from Nasāʾī 2524)  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «إِنَّ اللهَ لَا يَقْبَلُ صَلَاةً بِغَيْرِ طُهُورٍ وَلَا صَدَقَةً مِنْ غُلُولٍ»  

he heard Abu Hurairah say: “The Messenger of Allah said: 'No one gives charity from good sources - for Allah does not accept anything but that which is good - but the Most Merciful takes it in His right hand, even if it is a date, and it flourishes in the Hand of the Most Merciful until it becomes bigger than a mountain and he tends it as anyone of you would tend to his colt (i.e., young pony) or his young (weaned) camel.'” (Using translation from Ibn Mājah 1842)  

قَالَ رَسُولُ اللهِ ﷺ «مَا تَصَدَّقَ أَحَدٌ بِصَدَقَةٍ مِنْ طَيِّبٍ وَلَا يَقْبَلُ اللهُ إِلَّا الطَّيِّبَ إِلَّا أَخَذَهَا الرَّحْمَنُ بِيَمِينِهِ وَإِنْ كَانَتْ تَمْرَةً فَتَرْبُو فِي كَفِّ الرَّحْمَنِ حَتَّى تَكُونَ أَعْظَمَ مِنَ الْجَبَلِ كَمَا يُرَبِّي أَحَدُكُمْ فَلُوَّهُ أَوْ فَصِيلَهُ»