Is the narration true which states that the face of Adam, upon him be peace, blackened after his disobedience, then gradually returned to its white color after he fasted the White Days (the 13th, 14th, and 15th of the lunar month)?

What has been mentioned about the reason for naming the 'White Days' (Ayyam al-Bid) as being linked to the story of Adam (peace be upon him) and his color turning white after his fasting is incorrect. It has been reported with very weak chains of narration, and Ibn al-Jawzi described it as fabricated.

The correct explanation is that the 'White Days' were named as such because their nights become bright with the moon, and its clarity is evident throughout them, from beginning to end.