Declension table of ?iṣṭavat

Masculine	Singular	Dual	Plural
Nominative	iṣṭavān	iṣṭavantau	iṣṭavantaḥ
Vocative	iṣṭavan	iṣṭavantau	iṣṭavantaḥ
Accusative	iṣṭavantam	iṣṭavantau	iṣṭavataḥ
Instrumental	iṣṭavatā	iṣṭavadbhyām	iṣṭavadbhiḥ
Dative	iṣṭavate	iṣṭavadbhyām	iṣṭavadbhyaḥ
Ablative	iṣṭavataḥ	iṣṭavadbhyām	iṣṭavadbhyaḥ
Genitive	iṣṭavataḥ	iṣṭavatoḥ	iṣṭavatām
Locative	iṣṭavati	iṣṭavatoḥ	iṣṭavatsu

Compound iṣṭavat -

Adverb -iṣṭavantam