(1) باب ذِكْرِ أَفْضَلِ الأَعْمَالِ
It was narrated from Abu Hurairah that:
The Messenger of Allah [SAW] was asked: "Which deed is best?" "He said: Faith in Allah [SWT] and His messenger [SAW]." (ID)
Reference (ID): Sunan an-Nasa'i 4985 (ID)
In-book reference (ID): Book 47, Hadith 1 (ID)
English translation (ID): Vol. 6, Book 47, Hadith 4988 (ID)