Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 021

Sanskrit:

प्रियरावपदानि भाषसे मृत-सञ्जीविकयानया गिरा ।करवाणि किमद्य ते प्रियंवद मे वल्गितकण्ठ कोकिल ॥ २१ ॥

ITRANS:

priya-rāva-padāni bhāṣasemṛta-sañjīvikayānayā girākaravāṇi kim adya te priyaṁvada me valgita-kaṇṭha kokila

Translation:

O sweet-throated cuckoo, in a voice that could revive the dead you are vibrating the same sounds we once heard from our beloved, the most pleasing of speakers. Please tell me what I can do today to please you.

Purport:

As Śrīla Viśvanātha Cakravartī explains, though the song of a cuckoo is very pleasant, Lord Kṛṣṇa’s wives perceive it as painful because it reminds them of their beloved Kṛṣṇa and exacerbates their pain of separation.