Ali ibn Abi Hamzah narrated from Abu Basir, who said: I asked Abu Abdullah عليه السلام about a man who, out of ignorance, failed to shorten or shave his hair before leaving Mina. Imam عليه السلام said: "He should return to Mina and discard his hair there, whether by shaving or shortening. For someone performing Hajj for the first time, shaving is obligatory." It is also narrated: "He may shave in Mecca and carry his hair to Mina."