Rishi: Viśvāmitra Gāthina (traditional attribution for Mandala 3); within 3.60 the praise centres on Indra with the Ribhus
Devata: Indra with the Ribhus (Ṛbhavaḥ/ Saúdhanvanāḥ) as associated powers
Chandas: Triṣṭubh (likely; verse length and cadence typical of RV 3rd maṇḍala Indra hymns)
Samhita Patha (Devanagari)इन्द्रस्य सख्यमृभवः समानशुर्मनोर्नपातो अपसो दधन्विरे । सौधन्वनासो अमृतत्वमेरिरे विष्ट्वी शमीभिः सुकृतः सुकृत्यया ॥
Recitation with translationRig Veda 3.60.3
Transliterationíndrasya sakhyám ṛ́bhavaḥ sám ānaśur mánoḥ napāto apáso dadhanvire | saudhanvanā́so amṛtatvám ériré viṣṭvī́ śámībhiḥ sukṛ́taḥ sukṛtyáyā ||
Translationリブフ(R̥bhu)ら――マヌ(Manu)の子ら――はインドラ(Indra)との友誼を得、諸々の作業を起こして、その効力ある力をいよいよ強めた。スーダンヴァナ(Saudhanvana)たちは不死(amṛtatva)へと昇り、調和する技によって場を遍く満たし、善き行いにより善業を成就した。
Word by Wordसख्यम्friendship, alliance समानशुःthey attained, reached नपातःdescendants, offspring दधन्विरेthey set in motion, they hastened (their works) सौधन्वनासःthe sons of Sudhanvan एरिरेthey went/attained; they raised (themselves) विष्ट्वीhaving entered, after entering शमीभिःwith/through the śamī-trees (or śamī-woods) सुकृतःthe well-doers, the skilful सुकृत्ययाby good skill/workmanship 
