Declension table of ?śasta

Masculine	Singular	Dual	Plural
Nominative	śastaḥ	śastau	śastāḥ
Vocative	śasta	śastau	śastāḥ
Accusative	śastam	śastau	śastān
Instrumental	śastena	śastābhyām	śastaiḥ śastebhiḥ
Dative	śastāya	śastābhyām	śastebhyaḥ
Ablative	śastāt	śastābhyām	śastebhyaḥ
Genitive	śastasya	śastayoḥ	śastānām
Locative	śaste	śastayoḥ	śasteṣu

Compound śasta -

Adverb -śastam -śastāt