What is an idiom that begins with hexagrams?

Search for "melon idioms" and you will find the following.

Close the knife and check the divination [sh not u dāo Ji m:n guà]- refers to stop running amok.

Ask God to buy divination [wè n ti ā n m mi gu à]-ask God to predict good or bad luck.

Divination at the Gate of Hell [[[[guǐ mén zhān guà ]——]-Gate of Hell: a term in divination; Gua: Ancient divination symbol. Refers to the ominous signs of misfortune and disaster.