(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 a man's child (and his child's wealth) is part of his earnings" (Sahih )
Reference: Sunan an-Nasa'i 4449
In-book reference: Book 44, Hadith 1
English translation: Vol. 5, Book 44, Hadith 4454