Daniel 1:1, 1:8-18, Exodus 20:2, Exodus 20:7, Matthew 24:15, Luke 8:22-25.

As it was prophesied God gave Nebuchadnezzar the power to besieged Jerusalem because of their idolatry and for not observing the sabbaths as a holy day.

Daniel is a great example as to why we should not defile ourselves with the world's norms. He obeyed the prompting of God to not eat the king's choice food but to eat vegetables and water and the result of that obedient step was phenomenal that to him and his friends that God gave them "knowledge and intelligence in every branch of literature and wisdom". God's ways bring great results.