It is narrated from Hazrat Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "A person's children are also his earnings, and they are pure earnings."
Hadith Referenceمسند احمد / مسند النساء / 25400
Hadith Gradingحکم دارالسلام:حديث حسن لغيره، وهذا إسناد ضعيف لجهالة عمة عمارة