Yahya bin Yahya said: I read out to Imam Malik (may Allah have mercy on him) the narration of Nafi' from Ibn Umar (may Allah be pleased with them both) about the voluntary prayer of the Prophet (peace and blessings be upon him): "He (peace and blessings be upon him) would not pray after the Friday prayer, but when he returned home he would pray two rak'ahs in his house."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5942