(34) باب التَّكْبِيرِ لِلسُّجُودِ
It was narrated that Abdullah bin Mas'ud said:
"The Messenger of Allah (ﷺ) used to say the takbir every time he went down and came up, and he would say the Salam to his right and his left. And Abu Bakr and 'Umar used to do likewise." (JA)
Reference (JA): Sunan an-Nasa'i 1083 (JA)
In-book reference (JA): Book 12, Hadith 55 (JA)
English translation (JA): Vol. 2, Book 12, Hadith 1084 (JA)