(30) بَابُ بِرِّ الأَقْرَبِ فَالأَقْرَبِ
It is reported that al-Miqdam ibn Ma'dikarib heard the Messenger of Allah,may Allah bless him and grant him peace, say, "Allah enjoins you to be dutifulto your mothers. Then He enjoins you to be dutiful to your mothers. ThenHe enjoins you to be dutiful to your fathers. Then He enjoins you to be dutifulto your next closest relative and then to your next closest relative."
Reference: Al-Adab Al-Mufrad 60
In-book reference: Book 2, Hadith 14
English translation: Book 2, Hadith 60