Daniel 5 tells the story of Belshazzar, ruler of Babylon, who in a bout of drunkenness insulted the God of Israel.
This shirt has two sides. The first side contains the Hebrew words that God wrote on the palace wall: MENE, MENE, TEKEL, UPHARSIN.
The back side of the shirt contains the interpretation of God's words given to Belshazzar by the prophet Daniel:
God has numbered the days of your kingdom and brought it to an end.
You have been weighed in the balance and found wanting.
Your kingdom has been divided and given to the Medes and Persians.
The words on the front side of the shirt are in Hebrew, and the back side of the shirt includes Daniel's interpretation from Dan 5:26-28 in a handwritten-style (of course!) font. The wording on the back is adapted from the Revised English Bible.