"The messenger of Allah(ﷺ) was asked during the campaign of Tabuk about the Sutra of one who is praying. He said: "Something as high as the back of a camel saddle."
Sunan an-Nasa'i Book 9, Hadith 5
← Previous Hadith "While the people were in Quba praying Subh prayer, someone came to them and said that revelation had come to Messenger of Allah(ﷺ) the night before, and he had been commanded to face Ka'bah. So face toward it. They had been facing toward Ash-Sham, so they turned to face toward Ka'bah."

Sunan an-Nasa'i Book 9, Hadith 4 Next Hadith → It was narrated from Ibn Umar concerning the Messenger of Allah (ﷺ) he said: "He used to set up a short spear then pray facing toward it."

Sunan an-Nasa'i Book 9, Hadith 6