The ruling on concealing the act of a fornicator and following up with the perpetrator

Question:
Yes. If I see a man committing zina (unlawful sexual intercourse) with a woman in a specific place, and I verify that she is not lawful for him, my question is: should I conceal their act, or should I go and look for three men to come and witness it with me?

Answer:
Concealment is required, but if this is known and the act is repeated, one cannot remain silent about it. However, if this is the first time or if he has not been known for this before, then he should be concealed, along with advising him and warning him about this matter, considering what is between you and him. I say: Honorable Shaykh. Do not tell him, "I saw you doing it." Say, "I saw you with a woman, and I fear that you are not in a position for such matters, so avoid these matters through this door." But say, "I saw you praying with a woman, or that you are following her, or similar words that do not pin anything on him." Yes.