Abu Bakr bin Abi Shayba أبو بكر بن أبي شيبة · The Book of the Prayer

The Prophet used to pray Zuhr when the sun had passed its zenith.

"The Prophet used to pray the Hajir prayer, which you call 'Zuhr', when the sun had passed its zenith."

"We complained to the Messenger of Allah about the heat of the sunbaked ground, but he did not respond to our complaint."

"The Messenger of Allah said: 'When it is very hot, then wait for it to cool down before you pray, for intense heat is from the flaring up of the Hell-fire.'"

"The Messenger of Allah said: 'Wait for it to cool down before you pray the Zuhr.'"

"We were with the Messenger of Allah on a campaign, and he said: 'Hasten to perform prayer on a cloudy day, for whoever misses the 'Asr prayer, all his good deeds will be in vain.'"

"I heard the Messenger of Allah say: 'Do not let the Bedouin make you change the name of your prayer. It is the 'Isha', and they bring their camels in and milk them at nightfall.'"