(22) باب السَّلاَمِ لِلتَّحْلِيلِ مِنَ الصَّلاَةِ عِنْدَ فَرَاغِهَا وَكَيْفِيَّتِهِ
Abu Ma'mar reported:
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.
Reference: Sahih Muslim 581 a
In-book reference: Book 5, Hadith 151
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1206