The ruling on da'wah workers remaining silent about clarifying shirk (associating partners with Allah) and sorcery in their region

Question:
He says: Honorable Shaykh, may Allah grant you success. If sorcery and other types of shirk (associating partners with Allah) are widespread in a certain region, and there are da'wah workers there who know the state of the people, but they do not clarify it to them, do they sin by doing so? And does their work become impure with this indication?

Answer:
There is no doubt that they sin if they know that the country or region they are in has shirk (associating partners with Allah) and defective beliefs. It is obligatory for them to strive to advise the people and teach them. Most of the people are ignorant and do not realize that this shirk is a habit they have grown up with in their country. Teach them tawhid (the oneness of Allah), teach them 'aqidah (creed), teach them. Generally, regarding 'aqidah, explain it to them.
And that you remain silent and leave them in this state, you are the ones responsible before Allah (Glorified and Exalted is He) on the Day of Resurrection, because you know and they do not know, and you left them in this state. Yes. What about the spirit of tawhid (the oneness of Allah)? Did you teach the 'aqidah and have the people memorize it? We do not say you should teach them the lengthy books and large texts; teach them the summaries and the small treatises, and have them memorize them. There is great good in them. Yes.