Sunan Abu Dawud
4367
Sahih+2

The tradition mentioned above has also been transmitted by Anas. B. Malik through a different chain of narrators. This version has :Anas said : I saw one of them biting the earth with this mouth (teeth) on account of thirst and this they died

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid