Is the one who remains silent about a wrong that occurs in his presence considered to be concealing knowledge?

Question:
He says: Honorable Shaykh, may Allah grant you success, if a wrong occurs in front of me and I remain silent, am I considered among those who conceal knowledge?

Answer:
The wrong, as you know, in the hadith is removed by the hand; he who is able removes it with his hand. And he who is not able removes it with his tongue, clarifying that this is not permissible and that this is a wrong, and he advises the one who committed it and admonishes him. If he is not able to do this or that, he rejects it with his heart, disliking it and disliking the one who did it.