Charles Ellicott Commentary Daniel 1:8

"But Daniel purposed in his heart that he would not defile himself with the king`s dainties, nor with the wine which he drank: therefore he requested of the prince of the eunuchs that he might not defile himself." — Daniel 1:8 (ASV)

Daniel purposed in his heart.— He was cautious from the first. He feared that he might eat something that had been consecrated to idols. (See 1 Corinthians 8:1–13)