A certain fish swallowed the iron lump, and the bits of iron, carried back to the shore by the waves, implanted themselves there and grew into tall, sharp canes.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कश्चिन्मत्स्योऽग्रसील्लोहं चूर्णानि तरलैस्ततः । उह्यमानानि वेलायां लग्नान्यासन् किलैरकाः
kaścinmatsyo'grasīllohaṃ cūrṇāni taralaistataḥ | uhyamānāni velāyāṃ lagnānyāsan kilairakāḥ
SB 11.1.22