3 -examples from the Old Testament (Wisdom Books and Major Prophets)

1. Proverbs 30:15 "The leech has two daughters. 'Give! Give!' they cry. "There are three things that are never satisfied, four that never say, 'Enough!':
2. Proverbs 30:18 "There are three things that are too amazing for me, four that I do not understand: ...
3. Proverbs 30:21 "Under three things the earth trembles, under four it cannot bear up: ...
4. Proverbs 30:29 "There are three things that are stately in their stride, four that move with stately bearing: ...
5. Ecclesiastes 4:12 Though one may be overpowered, two can defend themselves. A cord of three strands is not quickly broken.
6. Isaiah 16:14 But now the LORD says: "Within three years, as a servant bound by contract would count them, Moab's splendor and all her many people will be despised, and her survivors will be very few and feeble."
7. Isaiah 20:3 Then the LORD said, "Just as my servant Isaiah has gone stripped and barefoot for three years, as a sign and portent against Egypt and Cush,
8. Ezekiel 14:14-18  even if these three men - Noah, Daniel and Job -were in it, they could save only themselves by their righteousness, declares the Sovereign LORD. ... as surely as I live, declares the Sovereign LORD, even if these three men were in it, they could not save their own sons or daughters. They alone would be saved, but the land would be desolate. ... as surely as I live, declares the Sovereign LORD, even if these three men were in it, they could not save their own sons or daughters. They alone would be saved.
9. Daniel 1:5 The king assigned them a daily amount of food and wine from the king's table. They were to be trained for three years, and after that they were to enter the king's service.
10. Daniel 3:23 and these three men, firmly tied, fell into the blazing furnace. Dan_3:24 Then King Nebuchadnezzar leaped to his feet in amazement and asked his advisers, "Weren't there three men that we tied up and threw into the fire?" They replied, "Certainly, Your Majesty."