Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: Abbas (may Allah be pleased with him) was travelling with the Prophet (peace and blessings be upon him) on a camel which he had branded on its face with fire. He (peace and blessings be upon him) asked: "O Abbas! What is this brand?" He said: "It is a brand that we used to apply in the Jahiliyyah." He (peace and blessings be upon him) said: "Do not brand by burning."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11933