On seeing Sa‘d coming, the Prophet (may Allah's peace and blessings be upon him) said: This is my maternal uncle. Is there anyone who has an uncle like him?
Chapter: The Virtues Of Sa'd bin Abi Waqqas, May Allah Be Pleased With Him, And The Name Of Abi Waqqas Is Malik Bin Wuhaib
حَدَّثَنَا أَبُو كُرَيْبٍ، وَأَبُو سَعِيدٍ الأَشَجُّ قَالاَ حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ مُجَالِدٍ، عَنْ عَامِرٍ الشَّعْبِيِّ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، قَالَ أَقْبَلَ سَعْدٌ فَقَالَ النَّبِيُّ صلى الله عليه وسلم
" هَذَا خَالِي فَلْيُرِنِي امْرُؤٌ خَالَهُ "
Jābir ibn ‘Abdullāh (may Allah be pleased with him) reported: On seeing Sa‘d coming, the Prophet (may Allah's peace and blessings be upon him) said: "This is my maternal uncle. Is there anyone who has an uncle like him?"
Sa‘d ibn Abi Waqqās approached a gathering of the Prophet (may Allah's peace and blessings be upon him) and when the Prophet saw him, he said: This is my maternal uncle, I am boasting about him. Let any person show me his maternal uncle, to show that no one has a maternal uncle like mine.
Sa‘d was from Banu Zuhrah clan, and the mother of the Prophet (may Allah's peace and blessings be upon him) āminah, was from Banu Zuhrah as well. So he was a relative of Āminah, and the relatives of the mother are referred to as maternal uncles.
Explanation in Arabic
أقبل سعد بن أبي وقاص رضي الله عنه إلى مجلس النبي صلى الله عليه وسلم فلما رآه النبي صلى الله عليه وسلم قال: هذا خالي أتباهى به، فليُرني أي إنسان خاله؛ ليظهر حينئذ أنه ليس لأحد خال مثل خالي، وكان سعد من بني زهرة، وكانت أم النبي صلى الله عليه وسلم آمنة من بني زهرة أيضًا، فهو قريب آمنة، وأقارب الأم أخوال.