'Thirty' in the Bible

and others fell upon the good ground, and yielded fruit, some a hundredfold, some sixty, some thirty.

And he that was sown upon the good ground, this is he that heareth the word, and understandeth it; who verily beareth fruit, and bringeth forth, some a hundredfold, some sixty, some thirty.

and said, What are ye willing to give me, and I will deliver him unto you? And they weighed unto him thirty pieces of silver.

Then Judas, who betrayed him, when he saw that he was condemned, repented himself, and brought back the thirty pieces of silver to the chief priests and elders,

Then was fulfilled that which was spoken through Jeremiah the prophet, saying, And they took the thirty pieces of silver, the price of him that was priced, whom certain of the children of Israel did price;