According to Oneness Pentecostals, the baby in the Bethlehem manger was the revelation of God the Father in the flesh as Son. That is, there is no separate Person of the Son. The Son is the flesh, while the Father is the deity. They challenge orthodox Christians to show where Scripture reveals a pre-existent Son. That is the question I wish to address.
In the Old Testament, I would refer first to Psalm 2:7-9: "The Lord said to Me, 'You are My Son; today I have begotten You. Ask of Me, and I will make the nations Your heritage, and the ends of the earth Your possession. You shall break them with a rod of iron and dash them in pieces like a potter’s vessel.'" This passage is applied to Christ in Hebrews 1:5. And secondly, II Samuel 7:14: "I will be to Him a Father, and He shall be to Me a Son." This text is also referred to Christ in Hebrews 1:5, though it was originally spoken of Solomon, as a type of Christ.
In the New Testament, we can look at Galatians 4:4: "When the fullness of time had come, God sent forth His Son, born of woman, born under the law." Notice that God sent His Son; He didn't come forth as His [own] Son! Thus, not only must the Son have already existed, but there is a distinction between the Father Who sends and the Son Who is sent.
Thus, we can see in just these three places, two in the Old Testament (but cited in the New) and one in the New Testament, that the Sonship of Christ didn't begin at His incarnation, but was an eternal aspect of His existence. This is not an exhaustive list, but suffices to demonstrate that the Oneness view misrepresents the teachings of Scripture.
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