[Machine] That Abu Bakr wrote this obligation of charity upon himself which the Messenger of Allah ﷺ obliged upon the Muslims. He mentioned the hadith in which it is mentioned that it should not be gathered between different things and should not be separated between things that are gathered, out of fear of charity and what comes from two mixtures. For indeed, they intermix with equality between them.  

أَنَّ أَبَا بَكْرٍ ؓ كَتَبَ لَهُ هَذِهِ فَرِيضَةُ الصَّدَقَةِ الَّتِي فَرَضَ رَسُولُ اللهِ ﷺ عَلَى الْمُسْلِمِينَ فَذَكَرَ الْحَدِيثَ وَفِيهِ لَا يُجْمَعُ بَيْنَ مُتَفَرِّقٍ وَلَا يُفَرَّقُ بَيْنَ مُجْتَمِعٍ خَشْيَةَ الصَّدَقَةِ وَمَا كَانَ مِنْ خَلِيطَيْنِ فَإِنَّهُمَا يَتَرَاجَعَانِ بَيْنَهُمَا بِالسَّوِيَّةِ