What is an outward symbol of repentance in the bible?

An outward symbol of repentance in The Bible is often represented by the act of wearing sackcloth and ashes. This practice signifies mourning, humility, and a genuine desire for forgiveness from God. For example, in the Book of Jonah, the people of Nineveh donned sackcloth and sat in ashes to demonstrate their repentance after hearing Jonah's warning. Another symbol is baptism, which represents a public declaration of repentance and a commitment to a transformed life.