Proverbs 22:20 New English Translation

²⁰Have I not written thirty sayings^[a] for you,
sayings^[b] of counsel and knowledge,

Proverbs 22:20 tn Older English versions and a few more recent ones render this phrase as either “excellent things” following the Qere (so KJV, ASV, NASB, NKJV), “officers,” or “heretofore” [day before yesterday], following the Kethib. However (as in most recent English versions) the Qere should be rendered “thirty,” referring to the number in the collection (cf. NAB, NIV, NRSV, NLT).
Proverbs 22:20 tn The term “sayings” does not appear in the Hebrew text but is supplied in the translation for the sake of clarity.

New English Translation (NET)