Ramayana
तमेवमुक्त्वा काकुत्स्थो हनूमन्तमथाब्रवीत् । जीविते कृतबुद्धिस्त्वं मा प्रतिज्ञां विलोपय ॥ 7-108-33 ॥
Having spoken thus to him, the descendant of Kakutstha then said to Hanuman: "You who are resolved upon remaining alive, do not break your vow."
english translation