My maternal aunt took me to the Messenger of Allah ﷺ and said, "Messenger of Allah, my nephew is in pain."He wiped my head and prayed for blessing upon me, then performed ablution, and I drank from the water of his ablution. Then I stood behind his back and looked at his seal between his shoulders, like the egg of a partridge.
ذهبت بي خالتي إلى رسول الله ﷺ فقالت: يا رسول الله، إن ابن أخي وجع، فمسح رأسي ودعا لي بالبركة، ثم توضأ فشربت من وضوئه، ثم قمت خلف ظهره فنظرت إلى خاتمه بين كتفيه كزر الحجلة.
Bukhari narrated it in the Book of Wudu (190, 3541), and Muslim in the Book of Virtues (2345), both through Hatim bin Ismail, from Jad bin Abdul-Rahman, who said, "I heard Saaib bin Yazid," and he mentioned something similar.Qurtubi said, "As for the phrase 'zirr al-hijlah,' the well known version has it as 'zirr,' with the zay letter coming first. Abu Faraj bin Jawzi said, 'The hijlah is a chamber like a dome, covered with cloth, fitted with a door of the same material, having a zirr and an urwa that are fastened when it is closed.' Qadi Abu Fadl said, 'The zirr is what women use to fasten the loops of their canopies, like the buttons of a shirt, and the hijlah here is the singular of hijal, meaning curtains with drapes.' Others said, 'The hijlah is the well known bird, and its zirr is its egg, just as Jabir said, "the egg of a dove."' Qurtubi said, 'The first meaning is better known for zirr, while the second is closer to the intended sense.'" Al-Mufhim (136/6).I say, Tirmidhi (2642) held the second view, and it is clearer than the first.