one's word is bond

(one's) word is (one's) bond

One always keeps one's promises. I promise that I'll be there in time with the money for the deposit: my word is my bond.
See also: bond, word
Farlex Dictionary of Idioms.

one's word is one's bond

Fig. one's statement of agreement is as sound as a posting of a performance bond. Of course, you can trust anything I agree to verbally. My word is my bond. There's no need to get it in writing.
See also: bond, word
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • (one's) word is (one's) bond
  • someone's word is their bond
  • your, his, etc. word is your, his, etc. bond
  • bond
  • word by word
  • from the word go
  • keep (one's) word
  • keep one's word
  • keep word
  • false friend