Musannaf Ibn Abi Shaybah 3322 — Those who said at how many feet

Sayyiduna Abdullah (may Allah be pleased with him) said: The first time of Zuhr is that you look at your feet; if you estimate three to five feet, this is the first time. And the first time of the next prayer is that you look at your feet and estimate five to seven feet. Al-Aswad bin Yazid said: I think he said this about winter.