Sunan Ibn Majah, Book 12, Hadith 2378 (In-Book) ⓘ
It was narrated from 'Aishah that the Messenger of Allah said: "The best of your provision is what you earn, and your children are part of what you earn. "
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا ابْنُ أَبِي زَائِدَةَ، عَنِ الأَعْمَشِ، عَنْ عُمَارَةَ بْنِ عُمَيْرٍ، عَنْ عَمَّتِهِ، عَنْ عَائِشَةَ، قَالَتْ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِنَّ أَطْيَبَ مَا أَكَلْتُمْ مِنْ كَسْبِكُمْ وَإِنَّ أَوْلاَدَكُمْ مِنْ كَسْبِكُمْ " .
also referenced under: Hadith 2290 (Reference) & Volume 3, Book 12, Hadith 2290 (DarusSalam)