Verses with the word ass's in the Old Testament (3 verses):

Genesis 49:11
Binding his foal unto the vine, and his ass's colt unto the choice vine; he washed his garments in wine, and his clothes in the blood of grapes:

2 Kings 6:25
And there was a great famine in Samaria: and, behold, they besieged it, until an ass's head was sold for fourscore pieces of silver, and the fourth part of a cab of dove's dung for five pieces of silver.

Job 11:12
For vain men would be wise, though man be born like a wild ass's colt.