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suyuti:2-1553bʿMr
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السيوطي:٢-١٥٥٣b

"عن عمرَ قَالَ: إنهَ لَيَخْرج من أحدِنَا مثلُ الجُمُانَةِ، وفى لفظٍ مثلُ الحريرةِ، فإِذَا وجَد أحدُكُمْ ذلك فليغسلْ ذكَرَهُ وليتوضأ وضوَءه للصلاة -يعنى المذْى-".  

مالك، [عب] عبد الرازق [ص] سعيد بن منصور

See similar narrations below:

Collected by Mālik, Bayhaqī
malik:2-55Mālik > Zayd b. Aslam from his father > ʿUmar b. al-Khaṭṭāb

Yahya related to me from Zayd ibn Aslam from his father that Umar ibn al-Khattab said, "I find it dropping from me like small beads. When you find that, wash your penis and do wudu as for prayer."  

مالك:٢-٥٥وَحَدَّثَنِي عَنْ مَالِكٍ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ أَبِيهِ أَنَّ عُمَرَ بْنَ الْخَطَّابِ

قَالَ إِنِّي لأَجِدُهُ يَنْحَدِرُ مِنِّي مِثْلَ الْخُرَيْزَةِ فَإِذَا وَجَدَ ذَلِكَ أَحَدُكُمْ فَلْيَغْسِلْ ذَكَرَهُ وَلْيَتَوَضَّأْ وُضُوءَهُ لِلصَّلاَةِ يَعْنِي الْمَذْىَ  

bayhaqi:1667Abū Aḥmad ʿAbdullāh b. Muḥammad b. al-Ḥasan al-ʿAdl > Abū Bakr b. Jaʿfar al-Muzakkī > Muḥammad b. Ibrāhīm > Ibn Bukayr > Mālik > Zayd b. Aslam from his father > ʿUmar b. al-Khaṭṭāb

[Machine] I find that it descends from me like a piglet. So, if any of you find that, let them wash their private parts and perform ablution for prayer, meaning the semen.  

البيهقي:١٦٦٧أَخْبَرَنَا أَبُو أَحْمَدَ عَبْدُ اللهِ بْنُ مُحَمَّدِ بْنِ الْحَسَنِ الْعَدْلُ أنبأ أَبُو بَكْرِ بْنُ جَعْفَرٍ الْمُزَكِّي ثنا مُحَمَّدُ بْنُ إِبْرَاهِيمَ ثنا ابْنُ بُكَيْرٍ ثنا مَالِكٌ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ أَبِيهِ عَنْ عُمَرَ بْنِ الْخَطَّابِ قَالَ

إِنِّي لَأَجِدُهُ يَنْحَدِرُ مِنِّي مِثْلَ الْخَزِيرَةِ فَإِذَا وَجَدَ أَحَدُكُمْ ذَلِكَ فَلْيَغْسِلْ ذَكَرَهُ وَلْيَتَوَضَّأْ وُضُوءَهُ لِلصَّلَاةِ يَعْنِي الْمَذْيَ