The affix ḍha comes in the sense of 'excellent with regard thereto' after the word sabhā in the chandas (Vedas).,
This debars य ॥ Thus सभेयः in सभेयोस्य युवा यजमानस्य वीरो जायताम् 'let a refined, youthful hero be born to this sacrificer'.,
ढश् छन्दसि
Adhyāya 4 · Pāda 4 · Rule 106