The Feast of the Immaculate Conception celebrates the absolute belief in the Immaculate conception of the Virgin Mary. It is celebrated 9 months before the Feast of the Nativity on September 8th, and is one of the most important Marian feasts celebrated in the liturgical calendar of the Roman Catholic Church celebrated worldwide!
In honor of the Feast of the Immaculate Conception, here is a quote from Surah Al ‘Imran (The House of ‘Imran), ayat 42 through 48 of the Qur’an:
(42)And [remember] when the angels said, “O Mary, truly God has chosen thee and purified thee, and has chosen thee above the women of the worlds. (43) O Mary! Be devoutly obedient to thy Lord, prostrate, and bow with those who bow.” (44) This is from the tidings of the Unseen, which We reveal unto thee. And thou wast not with them when they cast their lots [to choose] who among them would care for Mary, and thou wast not with them when they were disputing. (45) When the angels said, “O Mary, truly God gives thee glad tidings of a Word from Him, whose name is the Messiah, Jesus son of Mary, high honored in this world and the Hereafter, and one of those brought nigh. (46) He will speak to people in the cradle and in maturity, and will be among the righteous.” (47) She said, “My Lord, how shall I have a child while no human being has touched me?” He said, “Thus does God create whatsoever He will.” When He decrees a thing, He only says to it, “Be!” and it is. (48) And He will teach him the Book, Wisdom, the Torah, and the Gospel.
Nasr, Seyyed Hossein, Caner K. Dagli, Maria Massi Dakake, Joseph E. B. Lumbard, and Mohammed Rustom, eds., The Study Quran (San Francisco: HarperOne, 2015), Pp. 143-145.