Two thirds of a Mudd (of water) was brought to he Prophet (sallallahu alayhi wa sallam) (for ablution) so he began rubbing his arms.
وَعَنْ عَبْدِ اَللَّهِ بْنِ زَيْدٍ رضى الله عنه
«أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَتَى بِثُلُثَيْ مُدٍّ، فَجَعَلَ يَدْلُكُ ذِرَاعَيْهِ»
Two thirds of a Mudd (of water) was brought to he Prophet (sallallahu alayhi wa sallam) (for ablution) so he began rubbing his arms.
صحيح. رواه أحمد (4/39)، وابن خزيمة (118) واللفظ لابن خزيمة
In this Hadīth ‘Abdullāh ibn Zayd (may Allah be pleased with him) informs us about the amount of water used by the Prophet (may Allah's peace and blessings be upon him) for ablution, which is two-thirds of a Mudd. This quantity of water is enough for ablution without wasting. The Hadīth also tells us that the Prophet (may Allah's peace and blessings be upon him) began to rub his arm, so as to let water reach the washed limb completely.
From the Encyclopedia of Translated Prophetic Hadiths, hadeethenc.com.
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