Daniel 1:8

But Daniel purposed in his heart that he would not (m) defile himself with the portion of the king's meat, nor with the wine which he drank: therefore he requested of the prince of the eunuchs that he might not defile himself.

(m) Not that he thought any religion to be in the meat or drink (for afterwards he did eat), but because the king should not entice him by this sweet poison to forget his religion and accustomed sobriety, and that in his meat and drink he might daily remember of what people he was from. And Daniel brings this in to show how God from the beginning assisted him with his Spirit, and at length called him to be a Prophet.