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.
abudawud:757Muḥammad b. Qudāmah / Ibn Aʿyan > Abū Badr > Abū Ṭālūt ʿAbd al-Salām > Ibn Jarīr al-Ḍabbī from his father > Raʾayt

I saw Ali (Allah be pleased with him) catching hold of his left hand) by his right hand on the wrist above the navel. Abu Dawud said: Sa'id b. Jubair narrated the words: "above the navel". Abu Mijlaz reported the words: "below the navel". This has also been narrated by Abu Hurairah. But that is not strong.  

أبو داود:٧٥٧حَدَّثَنَا مُحَمَّدُ بْنُ قُدَامَةَ يَعْنِي ابْنَ أَعْيَنَ عَنْ أَبِي بَدْرٍ عَنْ أَبِي طَالُوتَ عَبْدِ السَّلاَمِ عَنِ ابْنِ جَرِيرٍ الضَّبِّيِّ عَنْ أَبِيهِ قَالَ

رَأَيْتُ عَلِيًّا ؓ يُمْسِكُ شِمَالَهُ بِيَمِينِهِ عَلَى الرُّسْغِ فَوْقَ السُّرَّةِ  

قَالَ أَبُو دَاوُدَ وَرُوِيَ عَنْ سَعِيدِ بْنِ جُبَيْرٍ فَوْقَ السُّرَّةِ وَقَالَ أَبُو مِجْلَزٍ تَحْتَ السُّرَّةِ وَرُوِيَ عَنْ أَبِي هُرَيْرَةَ وَلَيْسَ بِالْقَوِيِّ

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Collected by Suyūṭī
suyuti:4-264bJrīr al-Ḍab
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السيوطي:٤-٢٦٤b

"عَنْ جرِير الضَّبْىِّ قَالَ: رَأَيْتُ عَلِيا يُمْسِكُ شِمَالَهُ بِيَمِينِهِ عَلَى الرُّسغْ فَوْقَ السُّرةِ".  

[د] أبو داود