Imam Ahmad recorded that Al-Miqdam bin Ma`dikarib said that the Prophet said:

«إِنَّ اللهَ يُوصِيكُمْ بِآبَائِكُمْ إِنَّ اللهَ يُوصِيكُمْ بِأُمَّهَاتِكُمْ إِنَّ اللهَ يُوصِيكُمْ بِأُمَّهَاتِكُمْ إِنَّ اللهَ يُوصِيكُمْ بِأُمَّهَاتِكُمْ إِنَّ اللهَ يُوصِيكُمْ بِالْأَقْرَبِ فَالْأَقْرَب»

(Allah enjoins you concerning your fathers, Allah enjoins you concerning your mothers, Allah enjoins you concerning your mothers, Allah enjoins you concerning your mothers, Allah enjoins you concerning your close relatives then the next in closeness.) This was recorded by Ibn Majah from the Hadith of `Abdullah bin `Ayyash.