Daniel 3:18 (BSB)

But even if He does not, let it be known to you, O king, that we will not serve your gods or worship the golden statue you have set up.”

From Daniel 3. Also in the ESV.

Commentary on Daniel 3:18

• John Calvin (Reformed), Calvin's Commentaries on Daniel 3:18: WE said yesterday that the constancy of Shadrach, Meshach, and Abed-nego, was based upon these two reasons:-Their certain persuasion that God was the guardian of their life, and would free them from present death by his power if it were useful. And also their determination to die boldly and fearlessly, if God wished such a sacrifice to be offered. What Daniel relates of these three men belongs to us all.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Daniel 3:8-18: It was strange that Shadrach, Meshach, and Abednego, would be present at this assembly, when, it is likely, they knew for what intent it was called together. Daniel, we may suppose, was absent, either his business calling him away or having leave from the king to withdraw, unless we suppose that he stood so high in the king's favour that none durst complain of him for his noncompliance.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Daniel 3:18: But if not,.... If our God does not think fit to exert his power, and deliver us, which we are well assured he is able to do; if it is not his will, we are content, we are resigned unto it: be it known unto thee, O king, that we will not serve thy gods, be it as it will, whether we are delivered or...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Daniel 3:18: But if not, &c.--connected with Dan 3:18. "Whether our God deliver us, as He is able, or do not, we will not serve thy gods." Their service of God is not mercenary in its motive. Though He slay them, they will still trust in Him (Job 13:15).