Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Declaring God's oneness (saying La ilaha illa Allah) in a dream indicates guidance, martyrdom, and a good end.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Declaring God's oneness indicates relief and salvation from worry. Whoever sees himself declaring God's oneness will die upon monotheism (Tawhid).
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Declaring God's oneness is interpreted as goodness and blessing. Whoever sees himself declaring God's oneness will attain what he wishes for.