Declension table of ?ṛgvid

Neuter	Singular	Dual	Plural
Nominative	ṛgvit	ṛgvidī	ṛgvindi
Vocative	ṛgvit	ṛgvidī	ṛgvindi
Accusative	ṛgvit	ṛgvidī	ṛgvindi
Instrumental	ṛgvidā	ṛgvidbhyām	ṛgvidbhiḥ
Dative	ṛgvide	ṛgvidbhyām	ṛgvidbhyaḥ
Ablative	ṛgvidaḥ	ṛgvidbhyām	ṛgvidbhyaḥ
Genitive	ṛgvidaḥ	ṛgvidoḥ	ṛgvidām
Locative	ṛgvidi	ṛgvidoḥ	ṛgvitsu

Compound ṛgvit -

Adverb -ṛgvit