Charles Ellicott Commentary Daniel 4:27

"Wherefore, O king, let my counsel be acceptable unto thee, and break off thy sins by righteousness, and thine iniquities by showing mercy to the poor; if there may be a lengthening of thy tranquillity." — Daniel 4:27 (ASV)

Break off. The metaphor is taken from a refractory beast casting off the yoke. (Compare to Genesis 27:40, where it is foretold that Esau’s posterity shall “break off” the yoke of Jacob.) In Chaldee the word is used for the most part in the sense of putting on one side. Daniel therefore counsels the king to rebel against his sins, such as pride, harshness, and cruelty towards his captives, and to put all these sins aside. And how can he do this in a better manner than by practicing the contrary virtues?

Righteousness. In all wars of conquest many acts of injustice are perpetrated. The king is warned here to show justice or to act justly for the future. Similar counsel is given, though in different language (Micah 6:8). The idea of “alms” and “redeeming” is not conveyed by the Chaldee words, so that the translation “redeem your sins by alms” is incorrect and unwarrantable.

If it may be. That is, if Nebuchadnezzar will repent, his prosperity and peace will be prolonged.