What is the ruling on one who believes the Jews in their saying that the Prophet Solomon used to seek help from Iblis and his soldiers?

One must believe in all prophets, messengers, and heavenly books. Whoever disbelieves in a single prophet or insults him is a disbeliever and must be executed. Allah Almighty has absolved Prophet Solomon (peace be upon him) from what the Jews and others attributed to him concerning learning magic or disbelief, and clarified that magic is harmful and leads to disbelief. The true believer must believe in the disbelief of those whom Allah Almighty has deemed disbelievers, such as the Jews and Christians, or anyone who insults a prophet, while being cautious not to declare a Muslim a disbeliever or a fasiq (sinner) without proof.