Bulugh al-Maram, Book 3, Hadith 42 (In-Book)

Abu Ishaq narrated that ‘Abdullah bin Yazid placed a dead body in the grave from the side near the foot of the grave (i.e. the end which will accommodate the feet when the body is placed in it). He then said, ‘This is the Sunnah of the Prophet.’ Related by Abu Dawud.

وَعَنْ أَبِي إِسْحَاقَ, أَنَّ عَبْدَ اللَّهِ بْنَ يَزِيدَ ‏- رضى الله عنه ‏- { أَدْخَلَ الْمَيِّتَ مِنْ قِبَلِ رِجْلَيِ الْقَبْرَ، وَقَالَ: هَذَا مِنَ السُّنَّةِ } أَخْرَجَهُ أَبُو دَاوُد َ 1‏.‏ ‏1 ‏- صحيح.‏ رواه أبو داود (3211)‏.‏

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also referenced under: Book 3, Hadith 598 (English)