Hadith 21580

حَدَّثَنَا أَبُو أَحْمَدَ ، حَدَّثَنَا كَثِيرُ بْنُ زَيْدٍ ، عَنْ الْمُطَّلِبِ بْنِ عَبْدِ اللَّهِ ، قَالَ : تَمَارَوْا فِي الْقِرَاءَةِ فِي الظُّهْرِ وَالْعَصْرِ ، فَأَرْسَلُوا إِلَى خَارِجَةَ بْنِ زَيْدٍ ، قَالَ : أَبِي قَامَ ، أَوْ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : " يُطِيلُ الْقِيَامَ ، وَيُحَرِّكُ شَفَتَيْهِ ، فَقَدْ أَعْلَمُ ذَلِكَ لَمْ يَكُنْ إِلَّا لِقِرَاءَةٍ ، فَأَنَا أَفْعَلُ " .
Matlab bin Abdullah says that once there was a difference of opinion among some people regarding recitation in the Zuhr and Asr prayers, so they sent a man to Kharijah bin Zaid (may Allah have mercy on him) to ask about this issue. He narrated from his father that the Prophet Muhammad (peace and blessings be upon him) used to stand for a long time and would keep moving his lips. I think this could only be because of recitation, so I also recite (in these prayers).
Hadith Reference مسند احمد / مسند الأنصار رضي الله عنهم / 21580
Hadith Grading حکم دارالسلام: صحيح لغيره، وهذا إسناد حسن