Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The orator in a dream is a man of position and prestige. Hearing his sermon indicates admonition. If he is worthy of giving sermons, he will gain authority.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The orator indicates a man who enjoins good and forbids evil. Whoever sees himself give a sermon, his status will rise.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The orator is interpreted as the king or ruler. Whoever sees himself talk to him will receive goodness.