Sunan at-Tirmithiy كتاب البر والصلة باب ما جاء فى بر الوالدين
Mu‘āwiyah Ibn-Ḥaydah said, "I asked, ‘Messenger of God, to whom should I be dutiful?’ He replied, ‘Your mother.’ So, I asked, ‘Then to whom?’ He replied, ‘Your mother.’ So, I asked, ‘Then to whom?’ He replied, ‘Your mother.’ So, I asked, ‘Then to whom?’ He replied, ‘Your father, then your closest [relatives].’” Click on ḥadīth to read more