It is narrated from Hazrat Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to offer voluntary prayers on his camel during travel without determining the direction of the Qiblah.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 12277
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا اسناد ضعيف لجهالة بكار بن ماهان