Musannaf Ibn Abi Shayba 21:699

Yazid ibn Harun narrated to us, he said: Muhammad ibn Ishaq informed us, from Aban ibn Salih, that the Messenger of Allah (may Allah bless him and grant him peace) said: "If the mount of one of you or his camel bolts in a desolate land where he does not see anyone, let him say: 'Help me, O servants of Allah,' for he will be helped."