Declension table of ?iṣṭavrata

Masculine	Singular	Dual	Plural
Nominative	iṣṭavrataḥ	iṣṭavratau	iṣṭavratāḥ
Vocative	iṣṭavrata	iṣṭavratau	iṣṭavratāḥ
Accusative	iṣṭavratam	iṣṭavratau	iṣṭavratān
Instrumental	iṣṭavratena	iṣṭavratābhyām	iṣṭavrataiḥ iṣṭavratebhiḥ
Dative	iṣṭavratāya	iṣṭavratābhyām	iṣṭavratebhyaḥ
Ablative	iṣṭavratāt	iṣṭavratābhyām	iṣṭavratebhyaḥ
Genitive	iṣṭavratasya	iṣṭavratayoḥ	iṣṭavratānām
Locative	iṣṭavrate	iṣṭavratayoḥ	iṣṭavrateṣu

Compound iṣṭavrata -

Adverb -iṣṭavratam -iṣṭavratāt