Rigveda 1.51.11

मन्दि॑ष्ट॒ यदु॒शने॑ का॒व्ये सचाँ॒ इन्द्रो॑ व॒ङ्कू व॑ङ्कु॒तराधि॑ तिष्ठति ।उ॒ग्रो य॒यिं निर॒पः स्रोत॑सासृज॒द्वि शुष्ण॑स्य दृंहि॒ता ऐ॑रय॒त्पुर॑:॥

mandiṣṭa yaduśane kāvye sacām̐ indro vaṅkū vaṅkutarādhi tiṣṭhati |ugro yayiṃ nirapaḥ srotasāsṛjadvi śuṣṇasya dṛṃhitā airayatpura: ||

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