(182) باب كَيْفَ الْجُلُوسُ فِي التَّشَهُّدِ
It was reported from Ibrahim that he said:
"When the Prophet (ﷺ) would sit in the prayer, he would place his left foot horizontally - so much so that the upper-part of his foot became black."
Reference: Sunan Abi Dawud 962
In-book reference: Book 2, Hadith 573
English translation: Book 2, Hadith 957