مُوَطَّأُ مَالِكٍ
Muwatta Malik 12
The Times of Prayer
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ، أَنَّهُ قَالَ مَا أَدْرَكْتُ النَّاسَ إِلاَّ وَهُمْ يُصَلُّونَ الظُّهْرَ بِعَشِيٍّ .
Yahya related to me from Malik from Rabia ibn Abi Abd ar-Rahman that al Qasim ibn Muhammad said, "None of the companions that I met prayed dhuhr until well after noon,"(i.e.until when the sun had lost its fierceness).
Arabic/English book reference: Book 1, Hadith 12