(1) باب الْحَثِّ عَلَى الْكَسْبِ
It was narrated that 'Aishah said:
"The Messenger of Allah said: 'The best (most pure) food that a man eats is that which he has earned himself, and his child (and his child's wealth) is part of his earning,"
Reference: Sunan an-Nasa'i 4451
In-book reference: Book 44, Hadith 3
English translation: Vol. 5, Book 44, Hadith 4456