Muṇḍaka Upaniṣad 1.2.3

1.2.3

yasyāgnihotram adarśam apaurṇamāsam acāturmāsyam anāgrayaṇam atithivarjitaṃ ca.
ahutam avaiśvadevam avidhinā hutam ā saptamāṃs tasya lokān hinasti.

3. If one's Agnihotra sacrifice is not followed by the sacrifice of the new moon and of the full moon, by the four-months sacrifice, by the harvest sacrifice, if it is unattended by guests, or not offered at all, or without the ceremony to all the gods, or not according to rule, it destroys his seven worlds.