Rig Veda 3.27.1

Sanskrit text [Accents, Plain, Transliterated]:

प्र वो॒ वाजा॑ अ॒भिद्य॑वो ह॒विष्म॑न्तो घृ॒ताच्या॑ । दे॒वाञ्जि॑गाति सुम्न॒युः ॥
प्र वो वाजा अभिद्यवो हविष्मन्तो घृताच्या । देवाञ्जिगाति सुम्नयुः ॥
pra vo vājā abhidyavo haviṣmanto ghṛtācyā | devāñ jigāti sumnayuḥ ||

English translation:

“The months, the half months, (the gods) who are the receivers of oblations, with the butter-yielding kine, preside over your rite; the sacrificer, desirous of prosperity, worships the gods.”

Commentary by Sāyaṇa: Ṛgveda-bhāṣya

The months: pra vo vājā abhidyavo haviṣmanto ghṛtācyā: vājā = māsāḥ, months;

Abhīdyavaḥ = arddha māsāḥ, half months;

Haviṣmanta = having the havis. or oblation of butter; an epithet of devāḥ, gods (Taittirīya Samhitā 2.5.7.4); also explaiend by paśvaḥ, animals yielding milk, of which havis. ismade;

Ghṛtāci = gau; another meaning is, sruk, a ladle; pra implies prabhavanti, all these preside over your sacrificing

Details:

Ṛṣi (sage/seer): viśvāmitraḥ [viśvāmitra];
Devatā (deity/subject-matter): ṛtavo'gnirvā ;
Chandas (meter): nicṛdgāyatrī ;
Svara (tone/note): Swar;

Padapatha [Accents, Plain, Transliterated]:

प्र । वः॒ । वाजाः॑ । अ॒भिऽद्य॑वः । ह॒विष्म॑न्तः । घृ॒ताच्या॑ । दे॒वान् । जि॒गा॒ति॒ । सु॒म्न॒युः ॥
प्र । वः । वाजाः । अभिद्यवः । हविष्मन्तः । घृताच्या । देवान् । जिगाति । सुम्नयुः ॥
pra | vaḥ | vājāḥ | abhi-dyavaḥ | haviṣmantaḥ | ghṛtācyā | devān | jigāti | sumnayuḥ

Multi-layer Annotation of the Ṛgveda

[Rigveda 3.27.1 English analysis of grammar]