Hadith.3109 - It is narrated from Muawiyah ibn Ammar, who said: I asked Abu Abdullah عليه السلام about a man who sends a sacrificial animal voluntarily, not as an obligation. Imam عليه السلام said: "He should agree with his companions on a specific day, and they should mark it (as a sacrificial animal). From that moment, he must avoid what a person in Ihram avoids until the Day of Sacrifice. When the Day of Sacrifice arrives, it will suffice for him. Indeed, when the Messenger of Allah سبحانه وتعالى (peace and blessings be upon him and his family) was barred by the polytheists at Hudaybiyyah, he slaughtered (his sacrificial animal), exited Ihram, and returned to Medina."