How do we know that God marks those who mourn for sin?

Ezekiel 9 illustrates how God uses a mark to separate His people from others during judgment. This mark signifies a genuine grief for the sins committed in the land and within the individual's heart. The act of sighing and crying for sin is indicative of a living faith that recognizes the severity of rebellion against God. It's not merely intellectual acknowledgment; it represents an emotional and spiritual reaction to the reality of sin. This distinguishes them from those unperturbed by sin, signaling their belonging to God as part of His elect, who are aware of their need for mercy.