Steve Ray has a list of more than 35 loaded Questions for "Bible Christians" (quotation marks his)(link to the whole list). I originally planned to respond to just 35 of them, but the series seems to have been of interest, so in this extension, I'm responding to three more numbered questions in his list, plus fourteen "bonus questions" that take the form "Where does the Bible say ... ." I'm trying to provide the answers in the same common format as the original series, for easy reference. This is number 14/17.
Where does the Bible . . .
. . . .tell us Jesus Christ was both fully God and fully man from the moment of conception (e.g. how do we know His Divinity wasn't infused later in His life?) and/or tells us Jesus Christ is One Person with two complete natures, human and Divine and not some other combination of the two natures (i.e., one or both being less than complete)?
1) We know that Jesus was the Lord in his mother's womb at least from this verse:
Luke 1:43 And whence is this to me, that the mother of my Lord should come to me?
2) We also know that Jesus was conceived by the power of the Holy Ghost by this verses:
Luke 1:35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
3) The same verse above tells us that Jesus is God ("the Son of God") and another verse in the immediate context also shows that Jesus is both man ("the son of his father David") and God ("Son of the Highest"):
Luke 1:32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David:
There are many treatises that examine this important Scriptural doctrine in much greater depth, especially those by Athanasius and the men of his generation, the generation before him, and the generations immediately following him. I've tried to give a simple and concise answer, but many writers from ancient times down to modern times, have given much greater and more comprehensive exegeses of Scripture to thoroughly demonstrate this same truth.
Another verse pair I could have included above, and perhaps should have, is the following:
Isaiah 7:14 Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
Matthew 1:23 Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.
The reason for this name is that Jesus was not just a child (a human) but also God. He was really both things, not a hybrid, but God and man in two distinct natures and one person.