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
muslim:133 – Yūsuf b. Yaʿqūb al-Ṣaffār > ʿAlī b. ʿAthhām > Suʿayr b. al-Khims > Mughīrah > Ibrāhīm > ʿAlqamah > ʿAbdullāh

It is pure faith.  

مسلم:١٣٣ – حَدَّثَنَا يُوسُفُ بْنُ يَعْقُوبَ الصَّفَّارُ حَدَّثَنِي عَلِيُّ بْنُ عَثَّامٍ عَنْ سُعَيْرِ بْنِ الْخِمْسِ عَنْ مُغِيرَةَ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللَّهِ قَالَ

سُئِلَ النَّبِيُّ ﷺ عَنِ الْوَسْوَسَةِ قَالَ تِلْكَ مَحْضُ الإِيمَانِ  

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:10024 – Muḥammad b. ʿAbdullāh al-Ḥaḍramī > Yūsuf b. Yaʿqūb al-Ṣaffār > ʿAlī b. ʿAthhām b. ʿAlī > Suʿayr b. al-Khims > Mughīrah > Ibrāhīm > ʿAlqamah > ʿAbdullāh

[Machine] The Messenger of Allah ﷺ was asked about whispering, and he replied, "That is a sign of pure faith."  

الطبراني:١٠٠٢٤ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْحَضْرَمِيُّ ثنا يُوسُفُ بْنُ يَعْقُوبَ الصَّفَّارُ ثنا عَلِيُّ بْنُ عَثَّامِ بْنِ عَلِيٍّ عَنْ سُعَيْرِ بْنِ الْخِمْسِ عَنْ مُغِيرَةَ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللهِ قَالَ

سُئِلَ رَسُولُ اللهِ ﷺ عَنِ الْوَسْوَسَةِ فَقَالَ «ذَاكَ مَحْضُ الْإِيمَانِ»  

suyuti:430-357b – Ibn Masʿūd
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السيوطي:٤٣٠-٣٥٧b –

"عَنِ ابْنِ مَسْعُودٍ قَالَ: سُئِلَ رَسُولُ اللهِ ﷺ عَنِ الْوَسْوَسَةِ قَالَ: ذَاكَ مَحْضُ الإِيمَانِ".  

[طب] الطبرانى في الكبير [كر] ابن عساكر في تاريخه