Rishi: Vasiṣṭha (Vāsiṣṭha family, Mandala 7)
Devata: Agni as Hotar; also the collective Devas invited
Chandas: Triṣṭubh (probable; requires metrical scan for certainty)
Samhita Patha (Devanagari)समु वो यज्ञं महयन्नमोभिः प्र होता मन्द्रो रिरिच उपाके । यजस्व सु पुर्वणीक देवाना यज्ञियामरमतिं ववृत्याः ॥
Recitation with translationRig Veda 7.42.3
Transliterationsámu vo yajñáṃ mahayan námobhiḥ prá hotā́ mandró ririce upāké | yájasva sú purvaṇīka devā́nā yájñiyām arámatim vavṛtyāḥ ||
Translationわれは敬礼の行いをもって、汝らの祭献を調和のうちに高める。歓喜するホータル(Hotar)は、近くに据えられ、顕わとなった。古き面影の神々に善く供犠せよ。不正の思い(amati)を退け、祭にふさわしき思い(mati)を確立せよ。
Word by Wordसमुtogether; now, in conjunction यज्ञम्sacrifice; ritual offering महयन्magnifying; exalting नमोभिःwith acts of homage; with reverences प्रforth; forward; pre-eminently होताthe Hotṛ-priest (invoker) मन्द्रःgladdening; pleasant-voiced रिरिचेhas poured out; has bestowed उपाकेin the vicinity; near at hand पूर्वणीकO thou of ancient/foremost aspect यज्ञियाम्worthy of sacrifice; fit for worship अमतिम्folly; lack of right thought 
