حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَعَلِيُّ بْنُ مُحَمَّدٍ، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ بْنِ حَبِيبٍ، قَالُوا حَدَّثَنَا أَبُو مُعَاوِيَةَ، حَدَّثَنَا الأَعْمَشُ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، قَالَتْ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ إِنَّ أَطْيَبَ مَا أَكَلَ الرَّجُلُ مِنْ كَسْبِهِ وَإِنَّ وَلَدَهُ مِنْ كَسْبِهِ ‏"‏ ‏.‏

It was narrated from 'Aishah that the Messenger of Allah (PBUH) said: 'The best (most pure) food a man consumes is that which he has earned himself, and his child (and his child's wealth) is part of his earnings." Translation Not Available

Book Ref: Sunan Ibn Majah Book 12 Hadith 2137
Web Ref:  Sunan Ibn Majah Vol 3 Book 12 Hadith 2137