Hadithcore
Mishkat al-Masabih, 745

Malik said that ‘Umar built a courtyard called al-Butaiha’ in the neighbourhood of the mosque and said, “If anyone wants to make a noise, or recite poetry, or raise his voice, he must go out to this courtyard.” He transmitted it in <i>al-Muwatta'</i>.

وَعَن مَالك قَالَ: بَنَى عُمَرُ رَحَبَةً فِي نَاحِيَةِ الْمَسْجِدِ تُسَمَّى الْبُطَيْحَاءَ وَقَالَ مَنْ كَانَ يُرِيدُ أَنَّ يَلْغَطَ أَوْ يُنْشِدَ شِعْرًا أَوْ يَرْفَعَ صَوْتَهُ فَلْيَخْرُجْ إِلَى هَذِهِ الرَّحَبَةِ. رَوَاهُ فِي الْمُوَطَّأِ

References1 variant
In-Book Reference
Book 4, Hadith 173