The text is rephrased while maintaining its original meaning and significance. Here's the revised version:

We affirm that Jesus Christ, as revealed in holy scripture, existed prior to his birth in the flesh as the Being who was with God in the beginning. This preexistence is attested by multiple accounts in various texts, including those written by prophets and apostles. The Father chose Jesus as the Savior and Redeemer of mankind before the foundation of the world, and he was ordained to this position through his divine nature and rank.

The evidence for Christ's preexistence can be found in various scriptures, including those that describe his antemortal state and his appointment as the chosen Savior. For instance, the book of John states that Jesus was with God in the beginning, and he is the one who created all things. Similarly, the book of Isaiah describes how Lucifer, who was once a son of the morning, sought to exalt himself without regard to the rights and agency of others, leading to his rebellion against God.

In addition, modern prophets and apostles have testified to the preexistence of Christ, with some citing revelations given to Moses and other ancient prophets that describe Jesus as a divine being who was with God in the beginning. These testimonies confirm that Jesus was ordained as the Savior and Redeemer before the foundation of the world, and his mission among men is rooted in his preexistent nature as the Only Begotten Son of the Father.

In conclusion, the testimony of scriptures and the words of modern prophets and apostles confirm that Jesus Christ existed prior to his birth in the flesh and was appointed as the Savior and Redeemer of mankind before the foundation of the world. This preexistence is a central doctrine in Mormonism and underscores the divine nature of Jesus Christ and his mission among men.