Proverbs claims to be a compendium of the wise sayings of several different individuals.4Solomon originated some of them (10:1-22:16 and chs. 25-29 definitely, and probably chs. 1-9 as well).5Unnamed wise men (sages) wrote other parts (22:17-24:34 definitely, and possibly chs. 1-9). Hezekiah's men copied some of Solomon's proverbs and added them to this collection (chs. 25-29). Agur and King Lemuel produced chapters 30 and 31 respectively.
We do not know who the sages were who wrote 22:17-24:34 nor do we know the names of the men whom King Hezekiah instructed to compile some of Solomon's sayings. Agur and Lemuel are unknown to us also, though Lemuel seems to have been a non-Israelite monarch.6
Some of the proverbs appear to have been copied from, or at least influenced by, earlier Mesopotamian and Egyptian books of wisdom.7
". . . whatever the Spirit of God inspired the ancient writers to include became a part of the Word of the Lord. Such inclusions then took on a new and greater meaning when they formed part of Scripture; in a word, they became authoritative and binding, part of the communication of the divine will."8