When an extra word or statement is included in a chain or text and the listener takes it to be part of the Hadith, this is idrāj, insertion. Such a report is called mudraj.
• Insertion may occur in either chain or text.
• The key issue is that the added material is not distinguished from the original report.
• In the previous example, وَهُوَ التَّعَبُّدُ is a narrator’s explanation, not a separate Prophetic statement.