Declension table of ?iṣṭavrata

Neuter	Singular	Dual	Plural
Nominative	iṣṭavratam	iṣṭavrate	iṣṭavratāni
Vocative	iṣṭavrata	iṣṭavrate	iṣṭavratāni
Accusative	iṣṭavratam	iṣṭavrate	iṣṭavratāni
Instrumental	iṣṭavratena	iṣṭavratābhyām	iṣṭavrataiḥ
Dative	iṣṭavratāya	iṣṭavratābhyām	iṣṭavratebhyaḥ
Ablative	iṣṭavratāt	iṣṭavratābhyām	iṣṭavratebhyaḥ
Genitive	iṣṭavratasya	iṣṭavratayoḥ	iṣṭavratānām
Locative	iṣṭavrate	iṣṭavratayoḥ	iṣṭavrateṣu

Compound iṣṭavrata -

Adverb -iṣṭavratam -iṣṭavratāt