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
abudawud:4400 – Yūsuf b. Mūsá > Wakīʿ > al-Aʿmash > Ayḍ Ḥattá Yaʿqil > al-Majnūn Ḥattá Yufīq

“... . Till he reaches puberty , and a lunatic till he is restored to consciousness.” ‘Umar then began to utter: Allah is most great.  

أبو داود:٤٤٠٠ – حَدَّثَنَا يُوسُفُ بْنُ مُوسَى حَدَّثَنَا وَكِيعٌ عَنِ الأَعْمَشِ نَحْوَهُ وَقَالَ أَيْضًا حَتَّى يَعْقِلَ وَقَالَ وَعَنِ الْمَجْنُونِ حَتَّى يُفِيقَ قَالَ

فَجَعَلَ عُمَرُ يُكَبِّرُ  

See similar narrations below:

Collected by Dārimī
darimi:3072 – Muḥammad b. ʿĪsá > Ḥammād b. Zayd > Maṭar al-Warrāq

[Machine] Umar and Ali, loyalty to the elder.  

الدارمي:٣٠٧٢ – حَدَّثَنَا مُحَمَّدُ بْنُ عِيسَى حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ قَالَ سَمِعْتُ مَطَرًا الْوَرَّاقَ يَقُولُ قَالَ

عُمَرُ وَعَلِيٌّ «الْوَلَاءُ لِلْكُبْرِ»