(a) instrumental: with you.
(b) dative: to/for you.
(c) genitive: yours. [Pali Primer Lesson 31]
DN2 Samaññaphala Sutta CSCD253/PTS1.85
Attamanaa te bhikkhuu bhagavato bhaasita.m abhinandunti.
delighted / they / monks / of the Blessed One / saying / ?
attamana (adj.) delighted.
bhikkhu (m.) monk.
bhagavato (gen. of bhagavant) of the Blessed One.
bhaasita (n.) saying.
abhinandunti ?
Please help me on the word abhinandunti. Thank you.