en_tn_condensed/num/30/02.md

a man makes a vow

"any man". The words "a man" refer to any man, not one particular man. Because a vow is a type of promise, men must do what they have vowed to do. A father or a husband has one day in which to cancel a woman's vow. Otherwise, she must do what she vowed she would do.

to bind himself with a binding promise

"committing to fulfill a promise" or "promising to do something"

he must not break his word. He must keep his promise to do everything that comes out of his mouth

Here "word" refers to what he said. These two sentences are combined to emphasize that he must fulfill his promises.

he must not break his word

"he must fulfill his promises"

everything that comes out of his mouth

"to do everything that he says he will do" Here the word "mouth" refers to the things that the man says.