Declension table of ?yajñopavītamantra

Masculine	Singular	Dual	Plural
Nominative	yajñopavītamantraḥ	yajñopavītamantrau	yajñopavītamantrāḥ
Vocative	yajñopavītamantra	yajñopavītamantrau	yajñopavītamantrāḥ
Accusative	yajñopavītamantram	yajñopavītamantrau	yajñopavītamantrān
Instrumental	yajñopavītamantreṇa	yajñopavītamantrābhyām	yajñopavītamantraiḥ
Dative	yajñopavītamantrāya	yajñopavītamantrābhyām	yajñopavītamantrebhyaḥ
Ablative	yajñopavītamantrāt	yajñopavītamantrābhyām	yajñopavītamantrebhyaḥ
Genitive	yajñopavītamantrasya	yajñopavītamantrayoḥ	yajñopavītamantrāṇām
Locative	yajñopavītamantre	yajñopavītamantrayoḥ	yajñopavītamantreṣu

Compound yajñopavītamantra -

Adverb -yajñopavītamantram -yajñopavītamantrāt