“I once asked abu ‘Abdillah (a.s.) about the decorating and placing something around the neck of the offering animal. He (the Imam) said, ‘It is not important whichever you did.’ I asked about marking the offering animal. He said, ‘Yes, mark it on its right side.’ I asked, ‘When should I do it?’ He said, ‘Do it when you want to assume the state of Ihram.”’