'Solemnly' in the Bible

With God as my witness, as well as the Messiah Jesus and the chosen angels, I solemnly call on you to carry out these instructions without prejudice, doing nothing on the basis of partiality.

Since you are in the presence of God, who gives life to everything, and in the presence of the Messiah Jesus, who gave a good testimony before Pontius Pilate, I solemnly charge you