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
ahmad:11234 –

[Machine] And from the Prophet of Allah, ﷺ , that he said to the guardian of Hell: "There are four walls, each one thicker than the other, equal to a distance of forty years."  

أحمد:١١٢٣٤ –

وَعَنْ رَسُولِ اللهِ ﷺ أَنَّهُ قَالَ لِسُرَادِقِ النَّارِ أَرْبَعُ جُدُرٍ كَثُفَ كُلِّ جِدَارٍ مِثْلُ مَسِيرَةِ أَرْبَعِينَ سَنَةً  

See similar narrations below:

Collected by Ḥākim, Suyūṭī
hakim:8775 – Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Baḥr b. Naṣr al-Khawlānī > ʿAbdullāh b. Wahb > ʿAmr b. al-Ḥārith > Darrāj > Abū al-Haytham > Abū Saʿīd

[Machine] The Messenger of Allah ﷺ said, "The thickness of the walls of Hell is seventy years' journey, and each wall has four curtains."  

الحاكم:٨٧٧٥ – حَدَّثَنَا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثَنَا بَحْرُ بْنُ نَصْرٍ الْخَوْلَانِيُّ ثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ عَنْ دَرَّاجٍ عَنْ أَبِي الْهَيْثَمِ عَنْ أَبِي سَعِيدٍ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «لَسُرَادِقُ النَّارِ أَرْبَعَةُ جُدُرٍ كُلُّ جِدَارٍ مِنْهَا مَسِيرَةُ أَرْبَعِينَ سَنَةً»  

هَذَا حَدِيثٌ صَحِيحٌ الْإِسْنَادِ وَلَمْ يُخْرِجَاهُ
suyuti:17223a –
Request/Fix translation

  

السيوطي:١٧٢٢٣a –

"لِسُرَادِق النار أرْبَعَةُ جُدُرٍ، كِثْفُ (*) كُلِّ جِدَارٍ مَسِيرَةُ أرْبَعِينَ سَنَةً".  

[حم] أحمد [ت] الترمذي وضعفه، [ع] أبو يعلى [حب] ابن حبّان [ك] الحاكم في المستدرك عن أبي سعيد