Three
The number three in the Bible represents completeness. That's why Jesus rose on the third day after the Crucifixion -- his transformation was complete. It's why Elijah stretched himself on the dead child three times, why Jonah was in the belly of the fish for three days, why the Lord called Samuel three times, and many more. It's also reflected in the fact that there are three levels of heaven, three levels of hell, three levels to human life and, ultimately, three aspects of the Lord Himself: Father, Son and Holy Spirit.
Jeremiah 33:10-12
10
Thus says Yahweh: Yet again there shall be heard in this place, about which you say, It is waste, without man and without animal, even in the cities of Judah, and in the streets of Jerusalem, that are desolate, without man and without inhabitant and without animal,
11
the voice of joy and the voice of gladness, the voice of the bridegroom and the voice of the bride, the voice of those who say, Give thanks to Yahweh of Armies, for Yahweh is good, for his loving kindness endures forever; [and of them] who bring [sacrifices of] thanksgiving into the house of Yahweh. For I will cause the captivity of the land to return as at the first, says Yahweh.
12
Thus says Yahweh of Armies: Yet again shall there be in this place, which is waste, without man and without animal, and in all its cities, a habitation of shepherds causing their flocks to lie down.
