Mahabharata 4.64.12

त्वया दायादवानस्मि कैकेयीनन्दिवर्धनत्वया मे सदृशः पुत्रो न भूतो न भविष्यति

tvayā dāyādavānasmi kaikeyīnandivardhanatvayā me sadṛśaḥ putro na bhūto na bhaviṣyati

Our plain-language meaning of this verse is waiting for scholar review.