Valmiki Ramayana Kishkindha Kanda Sarga 51 Shloka 14
Original Shlokaतमप्सरसि हेमायां सक्तं दानवपुङ्गवम्।।4.51.14।। विक्रम्यैवाशनिं गृह्य जघानेत्रः पुरन्दरः।
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हेमायाम् Hema, अप्सरसि an apsarasa or angel, सक्तम् infatuated, तम् him, दानवपुङ्गवम् great demon, ईशः lord, पुरन्दरः Indra, अशनिम् thunderbolt, गृह्य after taking, विक्रम्यैव with all his might, जघान attacked.
'Seeing this great demon in love with a heavenly apsara (nymph) called Hema, Lord Indra with all his might attacked him with his thunderbolt.