Valmiki Ramayana Yuddha Kanda Sarga 59 Shloka 59
Original Shlokaरावणस्यवचश्श्रुत्वावायुसूनुर्वचोऽब्रवीत् । प्रहृतंहिमयापूर्वमक्षंतवसुतंतव ।।6.59.59।।
1 source checked for this shloka
रावणस्य Ravana's, वचः words, श्रुत्वा hearing, वायुसूनुः son of wind god, वचः words, अब्रवीत् spoke, मया by me, पूर्वम् earlier, प्रहृतम् killed, तवसुतम् your son, अक्षम् Akshaya, तव your.
Having heard Ravana's words, Hanuman said, "Think of your son Akshaya killed by me earlier."