Hamzah Al-'A'idhi said:
"I heard Anas bin Malik say: 'When the Prophet (ﷺ) halted, he would not move on until he had prayed Zuhr.' A man said: 'Even if it was the middle of the day?' He said: 'Even if it was the middle of the day.'" (DE)
English reference (DE): Vol. 1, Book 6, Hadith 499 (DE)
Arabic reference (DE): Book 6, Hadith 502 (DE)