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Using a Filthy Siwak

Interpreters believe that if someone dreams of using a filthy siwak, it may indicate that they are spending ill-gotten money. However, it might also suggest that they are spending this unlawful money in what appears outwardly to be an act of obedience to God. This dream could be a warning against mixing lawful with unlawful.

Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam