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Trimming Excess Beard Hair

Scholars have said that whoever dreams of trimming their beard beyond a fistful, it indicates their payment of zakat (alms) on their wealth. As for graying hair in the beard, it symbolizes dignity and prestige, and dyeing the hair indicates concealment. If the dye is henna, it points to the dreamer's adherence to the Sunnah (Prophet's tradition).

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