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:4184 – Ḥafṣ b. ʿUmar > Shuʿbah > Abū Isḥāq > al-Barāʾ

The Messenger of Allah ﷺ had hair which reached the lobes of his ears.  

أبو داود:٤١٨٤ – حَدَّثَنَا حَفْصُ بْنُ عُمَرَ حَدَّثَنَا شُعْبَةُ عَنْ أَبِي إِسْحَاقَ عَنِ الْبَرَاءِ قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ لَهُ شَعْرٌ يَبْلُغُ شَحْمَةَ أُذُنَيْهِ  

See similar narrations below:

Collected by Abū Dāwūd, Aḥmad
abudawud:4185 – Makhlad b. Khālid > ʿAbd al-Razzāq > Maʿmar > Thābit > Anas

The hair of the Messenger of Allah ﷺ were up to the lobes of his ears.  

أبو داود:٤١٨٥ – حَدَّثَنَا مَخْلَدُ بْنُ خَالِدٍ حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا مَعْمَرٌ عَنْ ثَابِتٍ عَنْ أَنَسٍ قَالَ

كَانَ شَعْرُ رَسُولِ اللَّهِ ﷺ إِلَى شَحْمَةِ أُذُنَيْهِ  

ahmad:13606 – ʿAffān > Ḥammād b. Salamah > Ḥumayd > Anas b. Mālik

[Machine] The Prophet ﷺ would not let his hair go beyond the lobes of his ears.  

أحمد:١٣٦٠٦ – حَدَّثَنَا عَفَّانُ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ أَخْبَرَنَا حُمَيْدٌ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

كَانَ النَّبِيُّ ﷺ لَا يُجَاوِزُ شَعْرُهُ شَحْمَةَ أُذُنَيْهِ