Verses with the word boasteth in the Old Testament (3 verses):

Psalms 10:3
For the wicked boasteth of his heart's desire, and blesseth the covetous, whom the LORD abhorreth.

Proverbs 20:14
It is naught, it is naught, saith the buyer: but when he is gone his way, then he boasteth.

Proverbs 25:14
Whoso boasteth himself of a false gift is like clouds and wind without rain.