That which is required from the people of knowledge is that they spread it (knowledge) and that they do not let the people of falsehood be more active than them in this

Imām Ibn Bāz mentioned:¹

Rather, they are obligated to be more active than the people of falsehood by clarifying the truth and calling towards it wherever they may be; in the streets, in the cars, in the planes, in space shuttles, in their homes and any place they may be. It is upon the people of knowledge to forbid the evil in the best manner possible, to teach the people in the best way possible, with a good approach, kindness and forbearance. Allāh said:

Invite to the way of your Lord with wisdom and good instruction, and argue with them in a way that is best.
[Sūrah al-Naḥl, 16:125]

Endnotes:

[1] Majmūʿ al-Fatāwá of Shaykh Ibn Bāz 9-223.
Translated by: Munīb al-Ṣumālī