The great Rabbi Chaim Yosef David Azulay, of blessed memory (1724-1806), writes in his book Maaguel Tov, p. 14a (free translation):
On the 6th of Tammuz, two hours before midnight, we traveled diligently and walked all night and all day until 7:00 PM and arrived peacefully in Paris. Mr. Fabri came to visit, and we went to the house of his relative and stayed there for four hours. He and his relatives showed me very kind faces and wanted me to eat there with them. I told them I would only eat eggs boiled by myself, and they agreed. And I asked the aforementioned Gentile to tell me what he believed in. He replied, "In the Lord, the God of Israel." I looked into it and it seemed that this was indeed the case. I told him, "If that's so, recite the Shema Yisrael verse morning and night, observe the seven commandments, and beware of..." Shituf (see note below) but [believes] in fully uniting with God." He accepted and said that he would only pray to God, the Lord of Israel. When I first came here, Mr. Avraham Vidal told me to pray for the queen to get pregnant, and she's now four months along. Mr. Fabri told me, "Look, your prayer bore fruit." I replied that it wasn't because of my own righteousness, but because of the merit of my parents, of blessed memory.
Note: Shituf It means associating God with some other power. For example, believing that God left the governance of the material world in the hands of the constellations. He would be the God of Gods, the most powerful, but there are others. That is the concept of Shituf. The Bnei Noaj are not prohibited from the concept of Shituf, However, the Rebbe explains in a letter (Likutei Sichot vol. 16, p. 555) that although Shituf It is not forbidden for the Noahides, however, it is certainly not a positive commandment; they simply were not warned against making the mistake of thinking this way. The Rebbe refers to a commentary by Rashi on Deuteronomy 4:19, where he says that God did not prevent the Gentiles from being mistaken and thinking that the constellations have inherent power, so that later, when they commit idolatry, they would be punished.