Cārāyaṇīya Śikṣā 2.36

2.36

sparśā yatra na dṛśyante vargāntaiḥ saha saṃyutāḥ
yamāstatra nivartante śmaśānādiva bāndhavāḥ

Where stop consonants are not seen conjoined with class-finals,
twin transitional sounds turn back from there, like kinsmen from a cremation ground.