It has been prohibited to ride the beast which eats dung.
that a Bedouin gave a young female camel as a gift to the Messenger of Allah (ﷺ), so he in turn for that, gave him six young female camels. But he was not satisfied with that, so when that news reached the Prophet (ﷺ), he praised Allah, and expressed gratitude to Him, then said: ‘Indeed so-and-so gave a camel to me as a gift, so I reciprocated for that with six young she-camels, yet he became upset. So I decided that I would not accept a gift except from a Quraishi, or Ansari, or Dawsi.'”
“The martyr has six things (in store) with Allah: He is forgiven from the first drop of his blood that is shed; he is shown his place in Paradise; he is spared the torment of the grave; he is kept safe from the Great Fright; he is adorned with a garment of faith; he is married to (wives) from among the wide-eyed houris; and he is permitted to intercede for seventy of his relatives.”