Verses with the word blesseth in the Old Testament (8 verses):

Genesis 27:29
Let people serve thee, and nations bow down to thee: be lord over thy brethren, and let thy mother's sons bow down to thee: cursed be every one that curseth thee, and blessed be he that blesseth thee.

Numbers 24:9
He couched, he lay down as a lion, and as a great lion: who shall stir him up? Blessed is he that blesseth thee, and cursed is he that curseth thee.

Deuteronomy 15:6
For the LORD thy God blesseth thee, as he promised thee: and thou shalt lend unto many nations, but thou shalt not borrow; and thou shalt reign over many nations, but they shall not reign over thee.

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

Psalms 107:38
He blesseth them also, so that they are multiplied greatly; and suffereth not their cattle to decrease.

Proverbs 3:33
The curse of the LORD is in the house of the wicked: but he blesseth the habitation of the just.

Proverbs 27:14
He that blesseth his friend with a loud voice, rising early in the morning, it shall be counted a curse to him.

Isaiah 65:16
That he who blesseth himself in the earth shall bless himself in the God of truth; and he that sweareth in the earth shall swear by the God of truth; because the former troubles are forgotten, and because they are hid from mine eyes.