'Three' in the Bible

Have I not written to thee three times With counsels and knowledge?

The horseleach hath two daughters, crying, Give, give. There are three things that are never satisfied, yea, four things say not, It is enough:

There be three things which are too wonderful for me, yea, four which I know not:

For three things the earth is disquieted, and for four which it cannot bear:

There be three things which go well, yea, four are comely in going: