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
Nafi' said: Ibn Umar (may Allah be pleased with them both) used to lengthen the prayer before the Friday prayer and pray two rak'ahs at home after it, and he would say: "This is how the Prophet (peace and blessings be upon him) used to do."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5943