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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
bayhaqi:6138 – Abū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās > al-Rabīʿ > al-Shāfiʿī > Ibrāhīm > Jaʿfar b. Muḥammad

[Machine] The Prophet ﷺ used to observe i'tikaf on every Eid.  

البيهقي:٦١٣٨ – وَأَخْبَرَنَا أَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو ثنا أَبُو الْعَبَّاسِ أنبأ الرَّبِيعُ أنبأ الشَّافِعِيُّ أنبأ إِبْرَاهِيمُ ثنا جَعْفَرُ بْنُ مُحَمَّدٍ قَالَ

كَانَ النَّبِيُّ ﷺ يَعْتَمُّ فِي كُلِّ عِيدٍ