'Three' in the Bible

And a voice came to my ears, from the middle of the four beasts, saying, A measure of grain for a penny, and three measures of barley for a penny: and see that you do no damage to the oil and the wine.

And there came to my ears the cry of an eagle in flight in the middle of heaven, saying with a great voice, Trouble, trouble, trouble, to all on the earth, because of the other voices of the horns of the three angels, whose sounding is still to come.

And the peoples and tribes and languages and nations will be looking on their dead bodies three days and a half, and will not let their dead bodies be put in the earth.

And after three days and a half the breath of life from God went into them, and they got up on their feet; and great fear came on those who saw them.

And I saw coming out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits, like frogs.

And the great town was cut into three parts, and the towns of the nations came to destruction: and Babylon the great came into mind before God, to be given the cup of the wine of his wrath.

And on the east were three doors; and on the north three doors; and on the south three doors; and on the west three doors.