What does li-dhatihi signify in hasan li-dhatihi?

Hasan li-Dhatihi, Sahih li-Ghayrihi, and al-Tirmidhi’s Composite Terms

• All chains must pass through the same narrator
• The report must be recorded in both Sahih collections
• Its hasan grade is established only by another supporting chain
• The report qualifies as hasan through its own isnad