Born from the back of Brahma; from him came Mrtyu, the terror of the worlds.
At SB 3.12.25.
अधर्म
Adharma was born from the back of Brahma at SB 3.12.25, and from him came Mrtyu, the terror of the worlds. He is the counterpart of Dharma. At SB 3.12.29, when Brahma turns toward his daughter, the word adharma may also read as the unrighteous state itself rather than the person.
Śrīmad Bhāgavata Mahāpurāṇa 3.12.25 — Sanskrit Wikisource (pinned chapter page; Devanagari from the cross-validated transcription in validation/sanskrit_skandha3.json)
At SB 3.12.25.