Abu Ubaydah narrates that the voluntary prayer of Sayyiduna Abdullah (may Allah be pleased with him), from which he never reduced anything, was as follows: four rak'ahs before Zuhr, two rak'ahs after it, two rak'ahs after Maghrib, two rak'ahs after Isha, and two rak'ahs before the Fajr prayer.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9411