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
suyuti:422-477b – Ibn ʿUmar > Qāl Rasūl Allāh Ṣallá Allāh ʿLyh Wslm
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السيوطي:٤٢٢-٤٧٧b –

"عَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ الله ﷺ: لَهِىَ أَشَدُّ عَلَى الشَّيْطَانِ مِنَ الحَدِيدِ - يَعْنِى السُّبَابَةَ فِى الصَّلاَةِ - ".  

ابن النجار

See similar narrations below:

Collected by Aḥmad, Suyūṭī
ahmad:6000 – Muḥammad b. ʿAbdullāh Abū Aḥmad al-Zubayrī > Kathīr b. Zayd > Nāfiʿ

[Machine] The Messenger of Allah ﷺ said, "The index finger is more severe on Satan than iron."  

أحمد:٦٠٠٠ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ أَبُو أَحْمَدَ الزُّبَيْرِيُّ حَدَّثَنَا كَثِيرُ بْنُ زَيْدٍ عَنْ نَافِعٍ قَالَ كَانَ عَبْدُ اللهِ بْنُ عُمَرَ إِذَا جَلَسَ فِي الصَّلَاةِ وَضَعَ يَدَيْهِ عَلَى رُكْبَتَيْهِ وَأَشَارَ بِإِصْبَعِهِ وَأَتْبَعَهَا بَصَرَهُ ثُمَّ قَالَ

قَالَ رَسُولُ اللهِ ﷺ لَهِيَ أَشَدُّ عَلَى الشَّيْطَانِ مِنَ الْحَدِيدِ يَعْنِي السَّبَّابَةَ  

suyuti:422-365b – Ibn ʿUmar
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السيوطي:٤٢٢-٣٦٥b –

"عَنِ ابنِ عُمَرَ قَالَ: قَالَ رَسُولُ الله ﷺ : لَهِىَ أشَدُّ عَلَى الشَّيْطَانِ مِنَ الْحَدِيدِ، يَعْنِى السَّبَّابَة فِى الصَّلاَةِ".  

ابن النجار