Question: What specific part of the document that is the highest authority in Protestantism for morals reference Mary?

Knowledge 1: Protestantism
All Protestant denominations reject the notion of papal supremacy over the Church universal and generally deny the Roman Catholic doctrine of transubstantiation, but they disagree among themselves regarding the real presence of Christ in the Eucharist. The various denominations generally emphasize the priesthood of all believers, the doctrine of justification by faith alone (sola fide) rather than by or with good works, and a belief in the Bible alone (rather than with Catholic tradition) as the highest authority in matters of faith and morals (sola scriptura). The "Five solae" summarize the reformers' basic differences in theological beliefs in opposition to the teaching of the Roman Catholic Church of the day. [SEP] Knowledge 2: Immaculate Conception
The papal bull defining the dogma, Ineffabilis Deus, mentioned in particular the patrististic interpretation of Genesis 3:15 as referring to a woman, Mary, who would be eternally at enmity with the evil serpent and completely triumphing over him. It said the Fathers saw foreshadowings of Mary's "wondrous abundance of divine gifts and original innocence" "in that ark of Noah, which was built by divine command and escaped entirely safe and sound from the common shipwreck of the whole world; in the ladder which Jacob saw reaching from the earth to heaven, by whose rungs the angels of God ascended and descended, and on whose top the Lord himself leaned; in that bush which Moses saw in the holy place burning on all sides, which was not consumed or injured in any way but grew green and blossomed beautifully; in that impregnable tower before the enemy, from which hung a thousand bucklers and all the armor of the strong; in that garden enclosed on all sides, which cannot be violated or corrupted by any deceitful plots; in that resplendent city of God, which has its foundations on the holy mountains; in that most august temple of God, which, radiant with divine splendours, is full of the glory of God; and in very many other biblical types of this kind."
Knowledge 1: Protestantism
All Protestant denominations reject the notion of papal supremacy over the Church universal and generally deny the Roman Catholic doctrine of transubstantiation, but they disagree among themselves regarding the real presence of Christ in the Eucharist. The various denominations generally emphasize the priesthood of all believers, the doctrine of justification by faith alone (sola fide) rather than by or with good works, and a belief in the Bible alone (rather than with Catholic tradition) as the highest authority in matters of faith and morals (sola scriptura). The "Five solae" summarize the reformers' basic differences in theological beliefs in opposition to the teaching of the Roman Catholic Church of the day. [SEP] Knowledge 2: Catholic Church in England and Wales
The English Church was brought back under papal authority in 1553 and doctrinal and liturgical conformity at the beginning of the reign of Queen Mary I. The restoration of papal authority was celebrated by the majority of the nation and enforced by the Marian persecutions against Protestants. Her harshness was a success but at the cost of alienating a fairly large section of English society which had been moving away from some traditional Catholic devotional practices. The English it seems were quite caught up with the reforming movement on the Continent. At the time they were neither Calvinist nor Lutheran, but certainly leaning toward Protestantism (and by the late 16th century, were certainly Protestant).
Knowledge 1: Protestantism
All Protestant denominations reject the notion of papal supremacy over the Church universal and generally deny the Roman Catholic doctrine of transubstantiation, but they disagree among themselves regarding the real presence of Christ in the Eucharist. The various denominations generally emphasize the priesthood of all believers, the doctrine of justification by faith alone (sola fide) rather than by or with good works, and a belief in the Bible alone (rather than with Catholic tradition) as the highest authority in matters of faith and morals (sola scriptura). The "Five solae" summarize the reformers' basic differences in theological beliefs in opposition to the teaching of the Roman Catholic Church of the day. [SEP] Knowledge 2: Protestantism
Collectively encompassing more than 900 million adherents, or nearly forty percent of Christians worldwide, Protestantism is present on all populated continents.[t] The movement is more divided theologically and ecclesiastically than either Eastern Orthodoxy or Roman Catholicism, lacking both structural unity and central human authority. Some Protestant churches do have a worldwide scope and distribution of membership (notably, the Anglican Communion), while others are confined to a single country, or even are solitary church bodies or congregations (such as the former Prussian Union of churches). Nondenominational, evangelical, independent and other churches are on the rise, and constitute a significant part of Protestant Christianity.

Answer: Genesis 3:15