Albert Barnes on Acts 16:28

Do thyself no harm. This is the solemn command of religion in his case, and in all others. It enjoins on men to do themselves no harm--by self-murder, whether by the sword, the pistol, the halter; or by intemperance, and lust, and dissipation. In all cases Christianity seeks the true welfare of man. In all cases, if it were obeyed, men would do themselves no harm. They would promote their own best interests here, and their eternal welfare hereafter.

(b) "Paul cried" Prov 24:11,12, 1Thes 5:15