'Three' in the Bible

And seven sons and three daughters were born to him.

Then his livestock came to be seven thousand sheep and goats and three thousand camels and five hundred pairs of oxen and five hundred female donkeys, and he had very many slaves, and that man was greater than all the people of the east.

And his sons used to go and hold a feast {at each other's house} on his day, and they would send, and they would invite their three sisters to eat and to drink with them.

While this one was still speaking, {another} came and said, "The Chaldeans formed three divisions, and they made a raid on the camels, and they carried them away, and they struck your servants {by the edge of the sword}, but I escaped, [even] I alone, to tell you."

Thus Job's three friends heard of this calamity that had come upon him. So each set out from his [own] place: Eliphaz the Temanite and Bildad the Shuhite and Zophar the Naamathite. And they met together to come to console him and to comfort him.

Then these three men ceased from answering Job because he [was] righteous in his [own] eyes.

and {he became angry} at his three friends because they had not found an answer, and they had declared Job guilty.

When Elihu saw that there was no answer in the mouth of the three men, {he became angry}.

Look, God does all these [things] twice, three times with a person

{And he had} seven sons and three daughters.