Hadith 504280
Chapter 9: Shortening the Prayer - كتاب قصر الصلاة فى السفر
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، بَنَى رَحْبَةً فِي نَاحِيَةِ الْمَسْجِدِ تُسَمَّى الْبُطَيْحَاءَ وَقَالَ مَنْ كَانَ يُرِيدُ أَنْ يَلْغَطَ أَوْ يُنْشِدَ شِعْرًا أَوْ يَرْفَعَ صَوْتَهُ فَلْيَخْرُجْ إِلَى هَذِهِ الرَّحْبَةِ .
Yahya related to me from Malik that he had heard that Umar ibn al-Khattab set aside an area near the mosque called al-Butayha and said, "Whoever wishes to talk nonsense or recite poetry or raise his voice should go to that area."
Reference Muwatta Malik 504280
USC-MSA web (English) reference : Book 9, Hadith 96