Rig Veda 4.2.1

Sanskrit text [Accents, Plain, Transliterated]:

यो मर्त्ये॑ष्व॒मृत॑ ऋ॒तावा॑ दे॒वो दे॒वेष्व॑र॒तिर्नि॒धायि॑ । होता॒ यजि॑ष्ठो म॒ह्ना शु॒चध्यै॑ ह॒व्यैर॒ग्निर्मनु॑ष ईर॒यध्यै॑ ॥
यो मर्त्येष्वमृत ऋतावा देवो देवेष्वरतिर्निधायि । होता यजिष्ठो मह्ना शुचध्यै हव्यैरग्निर्मनुष ईरयध्यै ॥
yo martyeṣv amṛta ṛtāvā devo deveṣv aratir nidhāyi | hotā yajiṣṭho mahnā śucadhyai havyair agnir manuṣa īrayadhyai ||

English translation:

“He who has beenplaced immortal among the mortals, the observer of truth, a deity triumphant among gods, the invoker of the gods, the most diligent sacrificer, Agni; he has been plural ced (upon the altar) to lighten (the ceremony) by his (lustre), and for the elevation of the worshipper, through oblations (in heaven).”

Commentary by Sāyaṇa: Ṛgveda-bhāṣya

Amont the mortal: or, among mortal organs of sense, Agni being that of speech: agnir-vāg bhūtvā mukham prāviśat

Details:

Ṛṣi (sage/seer): vāmadevo gautamaḥ [vāmadeva gautama];
Devatā (deity/subject-matter): agniḥ ;
Chandas (meter): paṅktiḥ ;
Svara (tone/note): Swar;

Padapatha [Accents, Plain, Transliterated]:

यः । मर्त्ये॑षु । अ॒मृतः॑ । ऋ॒तऽवा॑ । दे॒वः । दे॒वेषु । अ॒र॒तिः । नि॒ऽधायि॑ । होता॑ । यजि॑ष्ठः । म॒ह्ना । शु॒चध्यै॑ । ह॒व्यैः । अ॒ग्निः । मनु॑षः । ई॒र॒यध्यै॑ ॥
यः । मर्त्येषु । अमृतः । ऋतवा । देवः । देवेषु । अरतिः । निधायि । होता । यजिष्ठः । मह्ना । शुचध्यै । हव्यैः । अग्निः । मनुषः । ईरयध्यै ॥
yaḥ | martyeṣu | amṛtaḥ | ṛta-vā | devaḥ | deveṣu | aratiḥ | ni-dhāyi | hotā | yajiṣṭhaḥ | mahnā | śucadhyai | havyaiḥ | agniḥ | manuṣaḥ | īrayadhyai

Multi-layer Annotation of the Ṛgveda

[Rigveda 4.2.1 English analysis of grammar]