The ruling on vowing a sacrificial animal for the one who helped find the son

Question:
The questioner says: My son is now twenty-four years old. When he was in the second grade of elementary school, I lost him and began searching for him but could not find him. A man of good character helped me in my search for him, and I told him, “If you find my son, I will sacrifice an animal for you,” meaning I made a vow to him. I found my son, praise be to Allah, after searching for him. After a while, the man came to the house where we live, but no one informed me. I looked for him but could not find him, and I kept asking about him and asking my relatives about it. One of the brothers said, “You must slaughter the animal and distribute this vow for the sake of Allah the Exalted.” So I slaughtered it and distributed the meat without informing this person. What is my duty now?

Answer:
Yes, you owe nothing, because you vowed something permissible. You vowed something permissible: to give this man a sheep or a lamb if you found your son. Since you found him, you have the choice between paying this sacrificial animal to that specific person or paying the expiation for an oath. You have the choice between fulfilling this vow and paying the expiation for an oath. However, since you did not give this lamb or this sacrificial animal to the specific person, you must pay the expiation for an oath. Yes.