What reward does he give to those who respond to his appeal?

O sons of God, For your brethren {brothers} who live in the east. territory of Romania [the Greek em-pire] as far west as the shore of the Mediterranean and the Hellespont, people of whatever rank, foot-soldiers and knights, poor and rich,to carry aid promptly to those Christians and to destroy that vile {disgusting} race from the lands of our friends... Moreover, Christ commands it.” All who die by the way, whether by land or by sea, or in battle against the pagans, shall have immediate remission {forgiveness} of sins.

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.