'Serving' in the Bible

[However] there are Judean men whom you have appointed over the affairs of the province of Babylon--Shadrach, Meshach, and Abednego--these men, O king, {pay you no heed} [and] [were] not serving your god, and the statue of gold that you set up they are not worshiping."

Nebuchadnezzar answered and said to them, "[Is it] true, Shadrach, Meshach and Abednego, [that] you are not serving my god, and [you are] not worshiping the statue of gold that I have set up?