Adam Clarke on Daniel 12:3

And they that be wise - Those who are thoroughly instructed in Christ's word and doctrine, shall shine - shall be eminently distinguished in the Christian Church by the holiness of their lives, and the purity of their creed.

And they that turn many to righteousness - They who, by preaching Christ crucified among their brethren, shall be the means of converting them to the Christian faith; shall be as the stars - bright luminaries in the Gospel kingdom of Jesus Christ. This also may be applied to the case of holy and useful men, particularly the faithful ministers of the Gospel, in the day of judgment. See Jam 5:20 (note), 1Cor 15:41-42 (note).