God will use a sign/miracle to display clearly to others that we are His chosen and maybe He already has. It will hopefully, help remind them not to speak ill of you or fight against you and there by help prevent them from bringing the strong judgement of God against them.
Numbers 17:9-11
9 When Moses brought all the staffs out from the LORD’s presence, he showed them to the people. Each man claimed his own staff.
10 And the LORD said to Moses: “Place Aaron’s staff permanently before the Ark of the Covenant to serve as a warning to rebels. This should put an end to their complaints against me and prevent any further deaths.”
11 So Moses did as the LORD commanded him.