The sunan prayers and their virtues - Section 2 Mishkat al-Masabih 1175
Arabic hadith text
وَعَنْهَا قَالَتْ: مَا صَلَّى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْعِشَاءَ قَطُّ فَدَخَلَ عَلَيَّ إِلَّا صلى أَربع رَكْعَات أَو سِتّ رَكْعَات. رَوَاهُ أَبُو دَاوُد
Translation
She said that God’s Messenger never came into her house after praying the evening prayer without praying four or six rak'as. Abu Dawud transmitted it.