What is the ruling on some imams of mosques saying in their Qunut supplication: "O Allah, by the right of the blood that was shed and the souls that perished, grant victory to those, and defeat Your enemies"?

The statement of the supplicant, "O Allah, by the right of such-and-such," falls under the category of tawassul (seeking nearness to Allah) in supplication. Tawassul by one of Allah's attributes is permissible. However, tawassul by the right of a created being, such as "by the right of so-and-so," is an innovation (bid'ah) according to the majority of scholars, and it is objectionable from two perspectives: first, it is an oath by other than Allah, and second, it involves the belief that someone has a right over Allah. This type of supplication has not been narrated from the Prophet (peace be upon him), nor from the Companions, the Tabi'in, or the Imams. Likewise, swearing by a created being upon the Creator is not permissible, as stated in the Hadith: "Whoever swears by other than Allah has committed shirk (polytheism)." Abu Hanifah and his two companions disliked the supplicant's statement: "I ask You by the right of so-and-so, or by the right of Your prophets and messengers." As for tawassul by "the status of so-and-so with You," it is also objectionable, for if it were permissible, the Companions would have done it after the death of the Prophet (peace be upon him) as they did during his lifetime. However, tawassul by following the Messenger, loving him, believing in him, and affirming the prophets, is among the best forms of supplication. Tawassul through a person has details: if the intention is to use him as a means because he is a supplicant or an intercessor during his lifetime, or because the supplicant loves and obeys him, then it is permissible. But if the intention is to swear by his essence, then this is disliked and forbidden. And asking by the right of blood (haqq ad-dima') is a type of innovation, whether the intention is to swear by it or to seek intercession through its prestige. The principle regarding tawassul is to stop until there is evidence [from the Quran or Sunnah].