'Only begotten' in the Bible

Yes, [you are to build a temple of the Lord, but] it is He who shall build the [ultimate] temple of the Lord, and He shall bear the honor and majesty [as the only begotten of the Father] and sit and rule on His throne. And He shall be a Priest on His throne, and the counsel of peace shall be between the two offices [Priest and King].”’

Moreover, upon the house of David and upon the citizens of Jerusalem, will I pour out the spirit of grace and prayer, so that they shall look upon me, whom they have pierced: and they shall beweep him, as men mourn for their only begotten son: Yea, and be sorry for him, as men are sorry for their first child