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:2-708b – ʿUmar > Iyyākum And Muwāṭanah al-Aʿājim
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السيوطي:٢-٧٠٨b –

"عَنْ عُمَرَ قَالَ: إِيَّاكُمْ وَمُوَاطَنَةَ الأَعَاجِمِ، وَأَنْ تَدْخُلُوا فِي بِيَعِهِمْ يَوْمَ عِيدهِمْ، فَإِنَّ السَّخْطَةَ تَنْزِلُ عَلَيْهِمْ".  

[عب] عبد الرازق وأبو القاسم الخرقي في فوائده، [ق] البيهقى في السنن

See similar narrations below:

Collected by Bayhaqī
bayhaqi:18861 – Abū Ṭāhir al-Faqīh > Abū Bakr al-Qaṭṭān > Aḥmad b. Yūsuf al-Sulamī > Muḥammad b. Yūsuf > Sufyān > Thawr b. Yazīd > ʿAṭāʾ b. Dīnār > ʿUmar

[Machine] 'Omar said, "Do not learn the language of the non-Arabs and do not enter the places of worship of the polytheists on their festival day, as indeed wrath will descend upon them."  

البيهقي:١٨٨٦١ – أَخْبَرَنَا أَبُو طَاهِرٍ الْفَقِيهُ أنبأ أَبُو بَكْرٍ الْقَطَّانُ ثنا أَحْمَدُ بْنُ يُوسُفَ السُّلَمِيُّ ثنا مُحَمَّدُ بْنُ يُوسُفَ ثنا سُفْيَانُ عَنْ ثَوْرِ بْنِ يَزِيدَ عَنْ عَطَاءِ بْنِ دِينَارٍ قَالَ

قَالَ عُمَرُ ؓ لَا تَعَلَّمُوا رَطَانَةَ الْأَعَاجِمِ وَلَا تَدْخُلُوا عَلَى الْمُشْرِكِينَ فِي كَنَائِسِهِمْ يَوْمَ عِيدِهِمْ فَإِنَّ السَّخْطَةَ تَنْزِلُ عَلَيْهِمْ