Solomon
Ecclesiastes 4:12ESV·traditional attribution

And though a man might prevail against one who is alone, two will withstand him—a threefold cord is not quickly broken.

Matthew Henry Presbyterian @wholebiblehenry

Here Solomon fastens upon another instance of the vanity of this world, that frequently the more men have of it the more they would have; and on this they are so intent that they have no enjoyment of what they have. Now Solomon here shows, I.

Commenting on Ecclesiastes 4:7-12

John Gill Reformed Baptist @doctorgill

And if one prevail against him, two shall withstand him,.... If an enemy, or a thief, or a robber, attack anyone of them, in friendship and fellowship together, and is more than a match for him; both joined together will be able to resist him; so that he shall not succeed in his enterprise, and do the mischief he designed; see Sa2 10:11; Thus, when...

Jamieson-Fausset-Brown Reformed @jfbcommentary

one--enemy. threefold cord--proverbial for a combination of many--for example, husband, wife, and children (Pro 11:14); so Christians (Luk 10:1; Col 2:2, Col 2:19). Untwist the cord, and the separate threads are easily "broken."