Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:2-1414b – ʿMr
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السيوطي:٢-١٤١٤b –

"عن عمر قال: اجْتَنِبوا أعداءَ اللَّه في عيدِهم".  

[خ] البخاري في تاريخه، [ق] البيهقى في السنن

See similar narrations below:

Collected by Bayhaqī
bayhaqi:18862 – Abū Bakr al-Fārisī > Abū Isḥāq al-Aṣfahānī > Abū Aḥmad b. Fāris > Muḥammad b. Ismāʿīl > Lī Ibn Abū Maryam > Nāfiʿ b. Yazīd > Sulaymān b. Abū Zaynab And ʿAmr b. al-Ḥārith > Saʿīd b. Salamah from his father > ʿUmar b. al-Khaṭṭāb

[Machine] Avoid the enemies of God on their holiday.  

البيهقي:١٨٨٦٢ – وَأَخْبَرَنَا أَبُو بَكْرٍ الْفَارِسِيُّ أنبأ أَبُو إِسْحَاقَ الْأَصْفَهَانِيُّ ثنا أَبُو أَحْمَدَ بْنُ فَارِسٍ ثنا مُحَمَّدُ بْنُ إِسْمَاعِيلَ قَالَ قَالَ لِي ابْنُ أَبِي مَرْيَمَ ثنا نَافِعُ بْنُ يَزِيدَ سَمِعَ سُلَيْمَانَ بْنَ أَبِي زَيْنَبَ وَعَمْرَو بْنَ الْحَارِثِ سَمِعَ سَعِيدَ بْنَ سَلَمَةَ سَمِعَ أَبَاهُ سَمِعَ عُمَرَ بْنَ الْخَطَّابِ ؓ قَالَ

اجْتَنِبُوا أَعْدَاءَ اللهِ فِي عِيدِهِمْ