Ibn Umar reported that whenever he was in Mecca and prayed the Friday prayer, he would move forward and pray two rakahs, then move forward again and pray four. When he was in Medina, he would pray the Friday prayer, then return to his house and pray two rakahs there, not praying in the mosque. When he was asked about this, he said, "The Messenger of Allah ﷺ used to do that."In another narration, Ata said, "I saw Ibn Umar praying after the Friday prayer. He would shift slightly away from the spot where he had prayed the Friday prayer, only a little, and pray two rakahs. Then he would walk a bit further than that and pray four rakahs."Ibn Jurayj said, I asked Ata, "How many times did you see Ibn Umar do this?"He replied, "Many times."
عن ابن عمر قال: كان إذا كان بمكة فصلى الجمعة تقدم فصلى ركعتين، ثم تقدم فصلى أربعا، وإذا كان بالمدينة صلى الجمعة ثم رجع إلى بيته فصلى ركعتين، ولم يصل في المسجد، فقيل له، فقال: كان رسول الله ﷺ يفعل ذلك. وفي رواية: رأيت ابن عمر يصلي بعد الجمعة فينماز عن مصلاه الذي صلى الجمعة فيه قليلا غير كثير، قال: فيركع ركعتين. قال: ثم يمشي أنفس من ذلك، فيركع أربع ركعات. قال ابن جريج: قلت لعطاء: كم رأيت ابن عمر يصنع ذلك؟ قال: مرارا.
Abu Dawud (1130) and Tirmidhi (523) both narrated this through the route of Ataa, from Ibn Umar, mentioning it. The wording is Abu Dawud's, while Tirmidhi abridged it, saying, "I saw Ibn Umar pray two rakahs after Jumuah, then afterward he prayed four." I say, Ibn Umar only intended to describe the practice of the Prophet ﷺ, which was two rakahs after Jumuah. As for the hadith about the four rakahs that he used to pray, it is not attributed to the Prophet's ﷺ practice, but rather it was Ibn Umar's own practice, due to his frequent performance of voluntary prayers in Makkah. The scholars have also differed regarding Ataa, saying that he did not hear anything directly from Ibn Umar, but only saw him. So his statement, "The Messenger of Allah ﷺ used to do that," is disconnected, and the correct position is the narration of Ibn Jurayj, that this was Ibn Umar's own practice, not the practice of the Messenger of Allah ﷺ.The second narration was reported by Abu Dawud (1133) through the route of Ibn Jurayj, Ataa informed me of it. As for his statement, "fa-yanmaz," it means "he moved away from his place," that is, he left it, meaning that he shifted from the spot in which he had prayed. And his statement, "anfas min dhalik" means "a little further than that."