This alleged miracle depicts a disembodied hand writing on a wall.

Evidence

When she had finished speaking thus, the house shook, and the upper hangings were opened, and a hand came out that we could see as far as the wrist. It was writing upon the lines of Solomon’s Seal inscribed in the middle of the wall: six lines. After completing what it had written, that hand departed from us, and the aforementioned hangings closed. — L. P. Harvey, Muslims in Spain, 1500 to 1614, 1832

Categorization

• QUESTION: Whose hand was it? The voice came from the direction of the Truth (qiblat al-haqq) - presumably God or Jesus writing his confirmation in the Solomon’s Seal on the wall.
• XREF: The disembodied hand writing on a wall echoes the Belshazzar’s feast episode, and the supernatural validation of a text parallels polemical miracle traditions in many religions.