Allah commanded His Messenger to convey what He sent him with, to proclaim and spread the Message, which means confronting the idolators with it. Ibn `Abbas said that the Ayah,

[فَاصْدَعْ بِمَا تُؤْمَرُ]

(Therefore openly proclaim that what you have been commanded,) means, "Go ahead with it.'' According to another report it means, (افْعَلْ مَا تُؤْمَرُ) "Therefore proclaim that which you commanded.'' Mujahid said, "It is reciting the Qur'an aloud during prayer.'' Abu `Ubaydah reported that `Abdullah bin Mas`ud said, "The Prophet was still practicing and preaching Islam secretly until this Ayah was revealed:

[فَاصْدَعْ بِمَا تُؤْمَرُ]

(Therefore openly proclaim that which you are commanded) then he and his Companions came out into the open.''