From him, from Muhammad ibn Abi Hamzah from Ibn Miskan from Malik al-Juhani, who said:
I asked Abu Abdillah عليه السلام about the time of Dhuhr prayer. Imam عليه السلام said: “When the sun passes its zenith, the time of the two prayers has entered.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 261