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.
tabarani:13074ʿAbdullāh b. Aḥmad b. Ḥanbal from my father > Muḥammad b. Salamah > Abū ʿAbd al-Raḥīm > Zayd b. Abū Unaysah > ʿUmar b. Nāfiʿ from his father

[Machine] Ibn Umar used to not say the Takbir (Allahu Akbar) after completing the prayer when he prayed alone during the days of Tashriq.  

الطبراني:١٣٠٧٤حَدَّثَنَا عَبْدُ اللهِ بْنُ أَحْمَدَ بْنِ حَنْبَلٍ حَدَّثَنِي أَبِي ثنا مُحَمَّدُ بْنُ سَلَمَةَ عَنْ أَبِي عَبْدِ الرَّحِيمِ عَنْ زَيْدِ بْنِ أَبِي أُنَيْسَةَ عَنْ عُمَرَ بْنِ نَافِعٍ عَنْ أَبِيهِ

«أَنَّ ابْنَ عُمَرَ كَانَ إِذَا صَلَّى وَحْدَهُ فِي أَيَّامِ التَّشْرِيقِ لَمْ يُكَبِّرْ دُبُرَ الصَّلَاةِ»