Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Coal in a dream is unlawful money from a ruler or a dangerous man. If it is not glowing (embers), it is an ominous man.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Coal indicates sustenance in which there is doubt. Whoever sees himself carrying coal is bearing a sin.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Coal is interpreted as a man of bad character. Burning coal indicates strife and war.