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

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِنَّ اللَّهَ ﷻ لاَ يَقْبَلُ صَلاَةً بِغَيْرِ طُهُورٍ وَلاَ صَدَقَةً مِنْ غُلُولٍ  

"The Messenger of Allah said: None gives charity from (wealth earned from) a good source - and 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 tended in the hand of the Most Merciful until it becomes grater than a mountain, just as one of you tends his foal or camel calf."' (Shih)  

قَالَ رَسُولُ اللَّهِ ﷺ مَا تَصَدَّقَ أَحَدٌ بِصَدَقَةٍ مِنْ طَيِّبٍ وَلاَ يَقْبَلُ اللَّهُ ﷻ إِلاَّ الطَّيِّبَ إِلاَّ أَخَذَهَا الرَّحْمَنُ ﷻ بِيَمِينِهِ وَإِنْ كَانَتْ تَمْرَةً فَتَرْبُو فِي كَفِّ الرَّحْمَنِ حَتَّى تَكُونَ أَعْظَمَ مِنَ الْجَبَلِ كَمَا يُرَبِّي أَحَدُكُمْ فَلُوَّهُ أَوْ فَصِيلَهُ