Funerals (Kitab Al-Jana'iz)
21/71. Chapter:
Making The Grave Deep
Sunan Abi Dawud
حَدَّثَنَا أَبُو صَالِحٍ، - يَعْنِي الأَنْطَاكِيَّ - أَخْبَرَنَا أَبُو إِسْحَاقَ، - يَعْنِي الْفَزَارِيَّ - عَنِ الثَّوْرِيِّ، عَنْ أَيُّوبَ، عَنْ حُمَيْدِ بْنِ هِلاَلٍ، بِإِسْنَادِهِ وَمَعْنَاهُ زَادَ فِيهِ " وَأَعْمِقُوا " .
The tradition mentioned above has also been transmitted by Humaid b. Hilal with a different chain of transmitters and to the same effect. This version adds: "And deepen (the graves)."
Reference : Sunan Abi Dawud 3216In-book reference : Book 21, Hadith 128English translation : Book 20, Hadith 3210