2 sentences

1. 这种行为无异于惹火自焚。

   zhè zhǒng xíng​wéi wú​yì​yú rě​huǒ zì​fén.

   Such behavior is tantamount to playing with fire and getting burned.

   Source: Dong Chinese Dictionary

2. 这种不负责任的行为无异于自掘坟墓。

   zhè zhǒng bù fù zé​rèn de xíng​wéi wú​yì​yú zì​jué​fén​mù.

   This irresponsible behavior is no different from digging one's own grave.

   Source: Dong Chinese Dictionary