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:5646a –
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السيوطي:٥٦٤٦a –

"إِنَّ الشَّيطَانَ يَهُمُّ بالْوَاحِدِ، وَيَهُمُّ بالاثْنَينِ. فَإِذَا كَانوا ثلاثَةً لَمْ يَهُمَّ بِهِم ".  

[ق] البيهقى في السنن عن سعيد بن المسيب مرسلًا، والبزار عنه عن أَبي هريرة موصولا

See similar narrations below:

Collected by Mālik, Suyūṭī
malik:54-37 – Mālik > ʿAbd al-Raḥman b. Ḥarmalah > Saʿīd b. al-Musayyab

Malik related to me from Abd ar-Rahman ibn Harmala that Said ibn al-Musayyab heard the Messenger of Allah ﷺ say, "Shaytan concerns himself with one and two. When there are three, he does not concern himself with them."  

مالك:٥٤-٣٧ – وَحَدَّثَنِي مَالِكٌ عَنْ عَبْدِ الرَّحْمَنِ بْنِ حَرْمَلَةَ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ

أَنَّهُ كَانَ يَقُولُ قَالَ رَسُولُ اللَّهِ ﷺ الشَّيْطَانُ يَهُمُّ بِالْوَاحِدِ وَالاِثْنَيْنِ فَإِذَا كَانُوا ثَلاَثَةً لَمْ يَهُمَّ بِهِمْ