O greatest of all good men, by the combination of Kali and Harsh Speech were born children named Mṛtyu (Death) and Bhīti (Fear). From the combination of Mṛtyu and Bhīti came children named Yātanā (Excessive Pain) and Niraya (Hell).
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
दुरुक्तौ कलिराधत्त भयं मृत्युं च सत्तम । तयोश्च मिथुनं जज्ञे यातना निरयस्तथा
duruktau kalirādhatta bhayaṃ mṛtyuṃ ca sattama | tayośca mithunaṃ jajñe yātanā nirayastathā
SB 4.8.4