'Thirty' in the Bible

and others fell upon the good ground, and were giving fruit, some indeed a hundredfold, and some sixty, and some thirty.

But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.

And said unto them, What will ye give me, and I will deliver him unto you? And they covenanted with him for thirty pieces of silver.

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

Then was fulfilled that which was spoken by Jeremy the prophet, saying, And they took the thirty pieces of silver, the price of him that was valued, whom they of the children of Israel did value;