In «الطَّالِبُ مُجْتَهِدٌ», الطَّالِبُ is the musnad ilayh and مُجْتَهِدٌ is the musnad. The assertion ascribes diligence to the student.
ElementFunction
Musnad ilayhThat about which something is asserted
MusnadThe predicate or description asserted
IsnādThe affirmative or negative relation
Verbal sentences also contain predication: «حَضَرَ زَيْدٌ» attributes arrival to Zayd. Isnād is therefore not restricted to the outward subject–predicate structure of a nominal sentence.