When the teeth grew, Varuṇa came and said to Hariścandra, “Now the animal has grown teeth, and you can perform the sacrifice.” Hariścandra replied, “When all its teeth have fallen out, then it will be fit for sacrifice.”
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
जाता दन्ता यजस्वेति स प्रत्याहाथ सोऽब्रवीत् । यदा पतन्त्यस्य दन्ता अथ मेध्यो भवेदिति
jātā dantā yajasveti sa pratyāhātha so'bravīt | yadā patantyasya dantā atha medhyo bhavediti
SB 9.7.12