Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Taharah (Purification)

said that he was with Allah's Messenger (SAW) once. He visited an Ansar woman who slaughtered for him a goat and he ate it. Then she brought a plate of dates from which he ate. He performed ablution for the salah of Dhuhr and prayed it. He returned and she again brought the remaining meat. He ate of it. Then he offered the salah of asr but did not perform ablution. [Ahmed14460, Nisai 185, Abu Dawud 191,192]