Midrash su Salmi 47:10

Raba expounded: "What is the meaning of the passage (Songs 6, 2) How beautiful are thy steps in sandals. It means. How beautiful were the steps of Israel, when they made a pilgrimage to celebrate the festival. The prince's daughter, daughter of Abraham, our father, who was called a prince; as it is said (Ps. 47, 10) The princes of the people are gathered together, the people of the God of Abraham. Why is the God of Abraham [mentioned], and not the God of Isaac or Jacob? The God of Abraham [is mentioned, because Abraham] was the first proselyte." R. Cahana said that R. Nathan b. Minyumi expounded in the name of R. Tanchum: "What is the meaning of the passage (Gen. 37, 24) And the pit was empty; there was no water in it. Since the passage says the pit was empty, do I not know that there was no water in it? And what is intimated by saying there was no water? Indeed there was no water, but there were serpents and scorpions in it."

There were two dumb men in the neighborhood of Rabbi, who were sons of the daughter of R. Jochanan b. Gudgada, and others say, sons of his sister, who, when Rabbis entered the house of learning, went in also, shook their heads, and muttered with their lips. Rabbi prayed for them and they were healed; and it was found that they were well versed on Halacha, and on the entire six sections of the Mishnah...

“Daughter of a nobleman,” the daughter of Abraham who was called noble, just as it says: “The noblemen of the people have assembled, the people of the God of Abraham…” (Psalms 47:10).¹⁹The midrash thus interprets the verse as referring to Israel as daughter of Abraham. “Your rounded thighs,” Rabbi Yoḥanan said: All the luxuries and delicacies in which Israel luxuriates, and enjoys in this world, are by the merit of circumcision, which is between the thighs. Rabbi Ḥiyya said: What did the Sages see that led them to establish healing in the eighth blessing?²⁰Of the Amida prayer. It corresponds to circumcision, which was given [to be performed] on the eighth [day]. That is what is written: “My covenant was with him, life and peace” (Malachi 2:5). “Like ornaments [ḥala’im],” how many illnesses [ḥalayim] result from it, how many babies are circumcised and die as a result.²¹The merit of this mitzva is great because the Jewish people observe it scrupulously despite the danger (Etz Yosef). Rabbi Natan said: There was an incident where I came to the province of Cappadocia and there was a certain woman there who bore male children and they would be circumcised and die. She circumcised the first and he died, the second and he died, the third and he died. She brought the fourth [child] before me, and I saw that its flesh was yellow. I examined him and I did not find the blood of circumcision in him. They said to me: ‘Should we circumcise him?’ I said to them: ‘Wait and leave him until the blood of circumcision comes to him, as we learned there:²²Mishna Shabbat 19:5. A sick child, one does not circumcise him until he heals. They left him [for a while, and then] circumcised him, and he survived, and they named him Natan after me.’ That is “like ornaments.”
Another matter, “like ornaments,” to what were these ornaments similar? Rabbi Ḥonya and the Rabbis, Rabbi Ḥonya said: To a capital of a pillar. The Rabbis say: To the hollow of a pearl. Who crafted it? “The handiwork of a master craftsman,” the handiwork of the Holy One blessed be He in the world. Rabbi Shmuel said: [This is analogous] to a king who had an orchard. He planted rows of nut trees, apple trees, and pomegranate trees and gave them to his son. He said to him: My son, I demand nothing of you, only that when these trees produce fruit, bring me a sample of them and give me a taste so that I may see my handiwork and rejoice in you. So too, the Holy One blessed be He said to Israel, My children, I demand nothing of you, only that when a firstborn son will be born to one of you, he shall consecrate it to My name. That is what is written: “Consecrate every firstborn to Me” (Exodus 13:2). And when you ascend on your way to the pilgrim festivals take him and all your males to appear before Me. Therefore, Moses cautioned Israel: “Three times during the year [all your males shall appear before…the Lord]” (Exodus 23:17).²³Since one who is uncircumcised cannot ascend for the pilgrimage festival (see Yevamot 72a), it is implied that the son has been circumcised.