John Gill Commentary 1 Corinthians 1:31

"that, according as it is written, He that glorieth, let him glory in the Lord." — 1 Corinthians 1:31 (ASV)

That, according as it is written
(Jeremiah 9:23Jeremiah 9:24) .

He that glorieth, let him glory in the Lord ;
not in his own wisdom, riches, and strength; but in Christ, as his wisdom, righteousness, sanctification, and redemption.