en_tn/pro/30/05.md

is tested

Words are spoken of as if they were metals that need someone to clean the bad parts out of them. AT: "is like a precious metal from which someone has removed all the useless material" (See: rc://en/ta/man/translate/figs-metaphor and rc://en/ta/man/translate/figs-explicit)

he is a shield to those who take refuge in him

The word "shield" is a metaphor for something that protects a person. AT: "he protects those who come and ask him to protect them" (See: rc://en/ta/man/translate/figs-metaphor)