Sayyiduna Abu Umamah al-Bahili (may Allah be pleased with him) said: We were with the Messenger of Allah (peace and blessings be upon him) on a military expedition, and the Messenger of Allah (peace and blessings be upon him) said: "Whoever is weak, let him go back." So the people began to turn back, and the road became narrow, and a man's camel stopped with him. He was brought to the Prophet (peace and blessings be upon him), and when he (peace and blessings be upon him) was told about him, he (peace and blessings be upon him) refused to lead the prayer over him. He called Sayyiduna Bilal (may Allah be pleased with him), who said: Here I am, O Messenger of Allah. The Prophet (peace and blessings be upon him) said: "Announce this: Paradise is not lawful for a disobedient one."
"And domestic donkeys are unlawful, and every beast of prey with fangs or claws is unlawful."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7762