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 dutiful to your mothers. Then He enjoins you to be dutiful to your mothers. Then He enjoins you to be dutiful to your fathers. Then He enjoins you to be dutiful to your next closest relative and then to your next closest relative."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا حَيْوَةُ بْنُ شُرَيْحٍ، قَالَ: حَدَّثَنَا بَقِيَّةُ، عَنْ بَحِيرٍ، عَنْ خَالِدِ بْنِ مَعْدَانَ، عَنِ الْمِقْدَامِ بْنِ مَعْدِي كَرِبَ، أَنَّهُ سَمِعَ رَسُولَ اللهِ صلى الله عليه وسلم يَقُولُ: إِنَّ اللَّهَ يُوصِيكُمْ بِأُمَّهَاتِكُمْ، ثُمَّ يُوصِيكُمْ بِأُمَّهَاتِكُمْ، ثُمَّ يُوصِيكُمْ بِآبَائِكُمْ، ثُمَّ يُوصِيكُمْ بِالأَقْرَبِ فَالأَقْرَبِ.
sunnah.com