Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Spitting in a dream is speech. If it is good, it is good speech. If it is ugly, it is ugly speech. Spitting on a wall indicates spending money.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Spitting indicates strength. Whoever spits on a man overpowers him with his words. Spitting blood indicates unlawful money.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Spitting is interpreted as speech. Spitting on the ground indicates buying property.