Riyad as-Salihin
Riyad as-Salihin 1098
The Excellence of Optional Prayers (Sunnah Mu'akkadah) along with the Obligatory Prayers
Arabic hadith text
وعن ابن عمر رضي الله عنهما، قال: صليت مع رسول الله صلى الله عليه وسلم، ركعتين قبل الظهر وركعتين بعدها، وركعتين بعد الجمعة، وركعتين بعد المغرب، وركعتين بعد العشاء" ((متفق عليه)).
Translation
Ibn 'Umar (May Allah be pleased with them) reported
I performed along with the Messenger of Allah (ﷺ) two Rak'ah of optional prayers before Zuhr and two after the Zuhr (noon prayer), and two after the Friday prayer, and two after the Maghrib (evening) prayer, and two after the 'Isha' (night) prayer."[Al-Bukhari and Muslim].