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Blood Release After Phlebotomy

Scholars have said that seeing blood exiting after phlebotomy may indicate repentance from sins. If the exited blood is black, it might symbolize persistence in a grave sin followed by repentance, as blood represents sin and its release signifies atonement in some interpretations.

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