'Sour' in the Bible

For afore the harvest, when the bud is perfect, and the sour grape is ripening in the flower, he shall both cut off the sprigs with pruning hooks, and take away and cut down the branches.

In those days they shall say no more, The fathers have eaten a sour grape, and the children's teeth are set on edge.

But every one shall die for his own iniquity: every man that eateth the sour grape, his teeth shall be set on edge.

What mean ye, that ye use this proverb concerning the land of Israel, saying, The fathers have eaten sour grapes, and the children's teeth are set on edge?

Their drink is sour: they have committed whoredom continually: her rulers with shame do love, Give ye.