Daniel 6:21

Then said Daniel unto the king, O king, live forever - The common form of salutation in addressing the king. See the note at Daniel 2:4. There might be more than mere form in this, for Daniel may have been aware of the true source of the calamities that had come upon him, and of the innocence of the king in the matter; and he doubtless recalled the interest which the king had shown in him when about to be cast into the den of lions, and his expression of confidence that his God would be able to deliver him Daniel 6:16, and he could not but have been favorably impressed by the solicitude which the monarch now showed for his welfare in thus early visiting him, and by his anxiety to know whether he were still alive.