The people of Nineveh believed God, and the genuineness of their belief in Him produced the evident works of repentance (Jonah 3:10). Measure the faith of those you have witnessed to by asking, “Do you believe what you have just heard?” If they say they don’t, question what part didn’t make sense. If they say they do believe it, ask where they would go if they were to die in their sins. If they say, “Heaven,” ask, “Why?” It is usually because they are still clinging to self-righteousness and you need to go back with the axe of the Law and chop out that root. If they say, “Hell,” ask what they are going to do about it. They will usually say, “Pray, and change my ways,” so repeat what you have told them: “Repent and trust in Jesus.” If they agree, ask, “When are you going to do that?” You want them to see the urgency. Today is the day of salvation.
Jonah 3:5 So the people of Nineveh believed God, proclaimed a fast, and put on sackcloth, from the greatest to the least of them.