Muhammad’s miracle was the Koran itself because earlier prophets’ miracles were rejected

Evidence

The Koran imposes unity on sacred history: if God is One and unchanging, so is the essential message of his prophets—and so is the eternal resistance of the damned. Even when confronted by the clear evidence of miracles performed by Moses, Jesus, and other prophets, they refused to believe the message. For this reason, Muhammad performed no miracles other than producing the Koran: “We refrain from sending Signs [miracles] because the men of former generations treated them as false” (Koran 17:61). — John V. Tolan, Saracens, 218

Categorization

• DEFINE: Explains the Koranic doctrine that Muhammad’s sole miracle is the Koran itself, and its theological rationale.
• XREF: Connects to the ongoing Christian-Muslim polemic tradition about miracle validation that recurs throughout Tolan’s survey of medieval polemics.