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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:581a – Zuhayr b. Ḥarb > Yaḥyá b. Saʿīd > Shuʿbah > al-Ḥakam And Manṣūr > Mujāhid > Abū Maʿmar

There was an Amir in Mecca who pronounced taslim twice. Abdullah said: Where did he get this sunnah? Al-Hakam said: There is a hadith to the effect that the Messenger of Allah ﷺ did like It.  

مسلم:٥٨١a – حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ عَنْ شُعْبَةَ عَنِ الْحَكَمِ وَمَنْصُورٍ عَنْ مُجَاهِدٍ عَنْ أَبِي مَعْمَرٍ أَنَّ أَمِيرًا كَانَ بِمَكَّةَ يُسَلِّمُ تَسْلِيمَتَيْنِ فَقَالَ عَبْدُ اللَّهِ أَنَّى عَلِقَهَا قَالَ

الْحَكَمُ فِي حَدِيثِهِ إِنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَفْعَلُهُ