Article 19: The Union and Distinction of the Two Natures in the Person of Christ.
We believe that by this conception the person of the Son is inseparably united and connected with the human nature, so that there are not two Sons of God, nor two persons, but two natures united in one single person; yet that each nature retains its own distinct properties. As then the divine nature hath always remained uncreated, without beginning of days or end of life, filling heaven and earth, so also hath the human nature not lost its properties, but remained a creature, having beginning of days, being a finite nature, and retaining all the properties of a real body. And though He hath by His resurrection given immortality to the same, nevertheless He hath not changed the reality of His human nature, forasmuch as our salvation and resurrection also depend on the reality of His body.
But these two natures are so closely united in one person, that they were not separated even by His death. Therefore that which He, when dying, commended into the hands of His Father, was a real human spirit, departing from His body. But in the meantime the divine nature always remained united with the human, even when He lay in the grave; and the Godhead did not cease to be in Him, any more than it did when He was an infant, though it did not so clearly manifest itself for a while. Wherefore we confess that He is very God, and very man: very God by His power to conquer death; and very man that He might die for us according to the infirmity of His flesh.