[Machine] To open a doorway of knowledge to you, I searched for it. I went to the city and asked about the saa' (a unit of measurement). They said, "Our saa' is the saa' of the Messenger of Allah ﷺ." I asked them, "What is your evidence for that?" They said, "We will bring you evidence tomorrow." So, when the morning came, around fifty sheikhs from the descendants of the Muhajireen and the Ansar came to me, each one of them carrying a saa' under his cloak. Each one of them would inform about his father or his household that this is the saa' of the Messenger of Allah ﷺ. I looked, and it was exactly the same. He said, "So I accepted it." Then, I abandoned the statement of Abu Hanifa regarding the saa' and I adopted the statement of the people of Madinah. Al-Husayn said, "I argued from that year." Then, I met Malik bin Anas and asked him about the saa', and he said, "Our saa' is the saa' of the Messenger of Allah ﷺ." I asked him, "How many ratls is it?" He said, "The weight cannot be measured by ratls. This is it." Al-Husayn said, "Then, I met Abdullah bin Zaid bin Aslam, and he said, 'My father informed me on the authority of my grandfather that this is the saa' of Umar.'"  

أَنْ أَفْتَحَ عَلَيْكُمْ بَابًا مِنَ الْعِلْمِ هَمَّنِي تَفَحَّصْتُ عَنْهُ فَقَدِمْتُ الْمَدِينَةَ فَسَأَلْتُ عَنِ الصَّاعِ فَقَالُوا صَاعُنَا هَذَا صَاعُ رَسُولِ اللهِ ﷺ قُلْتُ لَهُمْ مَا حُجَّتُكُمْ فِي ذَلِكَ؟ فَقَالُوا نَأْتِيكَ بِالْحُجَّةِ غَدًا فَلَمَّا أَصْبَحْتُ أَتَانِي نَحْوٌ مِنْ خَمْسِينَ شَيْخًا مِنْ أَبْنَاءِ الْمُهَاجِرِينَ وَالْأَنْصَارِ مَعَ كُلِّ رَجُلٍ مِنْهُمُ الصَّاعُ تَحْتَ رِدَائِهِ كُلُّ رَجُلٍ مِنْهُمْ يُخْبِرُ عَنْ أَبِيهِ أَوْ أَهْلِ بَيْتِهِ أَنَّ هَذَا صَاعُ رَسُولِ اللهِ ﷺ فَنَظَرْتُ فَإِذَا هِيَ سَوَاءٌ قَالَ فَعَايَرْتُهُ فَإِذَا هُوَ خَمْسَةُ أَرْطَالٍ وَثُلُثٌ بِنُقْصَانٍ مَعَهُ يَسِيرٍ فَرَأَيْتُ أَمْرًا قَوِيًّا فَقَدْ تَرَكْتُ قَوْلَ أَبِي حَنِيفَةَ فِي الصَّاعِ وَأَخَذْتُ بِقَوْلِ أَهْلِ الْمَدِينَةِ قَالَ الْحُسَيْنُ فَحَجَجْتُ مِنْ عَامِي ذَلِكَ فَلَقِيتُ مَالِكَ بْنَ أَنَسٍ فَسَأَلْتُهُ عَنِ الصَّاعِ فَقَالَ صَاعُنَا هَذَا صَاعُ رَسُولِ اللهِ ﷺ فَقُلْتُ كَمْ رِطْلًا هُوَ؟ قَالَ إِنَّ الْمِكْيَالَ لَا يُرْطَلُ هُوَ هَذَا قَالَ الْحُسَيْنُ فَلَقِيتُ عَبْدَ اللهِ بْنَ زَيْدِ بْنِ أَسْلَمَ فَقَالَ حَدَّثَنِي أَبِي عَنْ جَدِّي أَنَّ هَذَا صَاعُ عُمَرَ ؓ