Anandakanda 2.8.128

2.8.128

komalaṃ jāyate vajraṃ dinānte nātra saṃśayaḥ /
<vajramṛdūkaraṇa (6)>
vajraṃ tittirimāṃsena veṣṭitaṃ nikṣipenmukhe //

at the end of the day the diamond becomes tender; there is no doubt in this. / <Softening of diamond (6)> / One should insert into the mouth [of a frog] the diamond wrapped in partridge meat.