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Westminster Larger Catechism

Q. 37. How did Christ, being the Son of God, become man?

Q. 37. How did Christ, being the Son of God, become man? A. Christ the Son of God became man, by taking to himself a true body, and a reasonable soul, being conceived by the power of the Holy Ghost in the womb of the virgin Mary, of her substance, and born of her, yet without sin.