Making a Vow to Other Than Allah is Shirk and it is Invalid and Should not be Fulfilled and the Animal Consecrated is Dead Meat

Question :

Making a vow to other than Allah is invalid and should not be fulfilled. So if a person dedicates a sheep to Shaikh Muhyi-ud-Din or 'Abdul-Qadir Al-Jilani for example, to distribute its meat among the poor, and for the reward of it to reach the soul of the Shaikh and thereby for the one who makes the vow to receive blessings from the Shaikh according to their belief should such vows as these be fulfilled? And if they are not fulfilled, is it permissible to eat the meat of this sheep which was dedicated? And is this included in the meaning of Allah Most High's Words:
"and that on which Allah's Name has not heen mentioned while slaughtering (that which has been slaughtered as a sacrifice for others than Allah, or has been slaughtered for idols)"
Because the animal which was dedicated is a pure animal? And is this forbidden because of an invalid vow?

Answer:

Firstly: A vow to Allah and slaughtering for Allah are acts of worship. It is not permissible to dedicate any of this to other than Him, Most Glorified, Most High. Whoever vows to other than Allah, or slaughters for other than Allah, then he has committed an act of associating partners with Allah (Shirk) by worshipping other than Him. This sin is greater and more serious if the one who vows or slaughters to the dead believes that he can benefit or harm, because to do so is to associate partners with Allah in Lordship along with the Shirk in worship.

Secondly: Vowing to other than Allah should not be fulfilled; indeed, it is invalid and whatever was dedicated to other than Allah, such as permissible foods or an animal which is permissible to eat and which has not been slaughtered, then it belongs to its owner. If he slaughtered it for other than Allah, it becomes dead meat and it is forbidden for him or others to eat it and it is included in the generality of the above-mentioned Verse.

Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 6 Pages 414-415