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suyuti:2-1198bAslam
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السيوطي:٢-١١٩٨b

"عَنْ أَسْلَمَ أَنَّ عُمَرَ قَصَرَ الصَّلاةَ إِلَى خَيْبَرَ".  

مالك، [عب] عبد الرازق [ق] البيهقى في السنن

See similar narrations below:

Collected by Bayhaqī, Suyūṭī
bayhaqi:5390Abū Muḥammad ʿAbdullāh b. Yaḥyá al-Sukkarī > Abū ʿAlī Ismāʿīl b. Muḥammad al-Ṣaffār > Aḥmad b. Manṣūr al-Ramādī > ʿAbd al-Razzāq > Mālik > Zayd b. Aslam from his father

[Machine] That Umar shortened the prayer until Khaibar.  

البيهقي:٥٣٩٠أَخْبَرَنَا أَبُو مُحَمَّدٍ عَبْدُ اللهِ بْنُ يَحْيَى السُّكَّرِيُّ بِبَغْدَادَ أنبأ أَبُو عَلِيٍّ إِسْمَاعِيلُ بْنُ مُحَمَّدٍ الصَّفَّارُ ثنا أَحْمَدُ بْنُ مَنْصُورٍ الرَّمَادِيُّ ثنا عَبْدُ الرَّزَّاقِ أنبأ مَالِكٌ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ أَبِيهِ

أَنَّ عُمَرَ قَصَرَ الصَّلَاةَ إِلَى خَيْبَرَ