[Machine] According to the words of the Prophet ﷺ , "Whoever performs an action that is not in accordance with our command, it shall be rejected."
لِقَوْلِ النَّبِيِّ ﷺ: «مَنْ عَمِلَ عَمَلاً لَيْسَ عَلَيْهِ أَمْرُنَا، فَهْوَ رَدٌّ».
Messenger of Allah ﷺ sent the brother of the tribe of Bani Adi Al-Ansari as governor of Khaibar. Then the man returned, bringing Janib (a good kind of date). Messenger of Allah ﷺ asked him, "Are all the dates of Khaibar like that?" He replied, "No, by Allah, O Messenger of Allah ﷺ! We take one Sa' of these (good) dates for two Sas of mixed dates." Messenger of Allah ﷺ then said, "Do not do so. You should either take one Sa of this (kind) for one Sa' of the other; or sell one kind and then buy with its price the other kind (of dates), and you should do the same in weighing."
أَنَّ أَبَا سَعِيدٍ الْخُدْرِيَّ وَأَبَا هُرَيْرَةَ حَدَّثَاهُ أَنَّ رَسُولَ اللَّهِ ﷺ بَعَثَ أَخَا بَنِي عَدِيٍّ الأَنْصَارِيَّ وَاسْتَعْمَلَهُ عَلَى خَيْبَرَ فَقَدِمَ بِتَمْرٍ جَنِيبٍ فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ أَكُلُّ تَمْرِ خَيْبَرَ هَكَذَا قَالَ لاَ وَاللَّهِ يَا رَسُولَ اللَّهِ إِنَّا لَنَشْتَرِي الصَّاعَ بِالصَّاعَيْنِ مِنَ الْجَمْعِ فَقَالَ رَسُولُ اللَّهِ ﷺ لاَ تَفْعَلُوا وَلَكِنْ مِثْلاً بِمِثْلٍ أَوْ بِيعُوا هَذَا وَاشْتَرُوا بِثَمَنِهِ مِنْ هَذَا وَكَذَلِكَ الْمِيزَانُ