'Buyest' in the Bible

When thou buyest a Hebrew servant -- six years he doth serve, and in the seventh he goeth out as a freeman for nought;

And if thou sell ought unto thy neighbour, or buyest ought of thy neighbour's hand, ye shall not oppress one another:

Then said Boaz, What day thou buyest the field of the hand of Naomi, thou must buy it also of Ruth the Moabitess, the wife of the dead, to raise up the name of the dead upon his inheritance.