Verses with the word diminish in the Apocrypha (3 verses):

Sirach 28:8
Abstain from strife, and thou shalt diminish thy sins: for a furious man will kindle strife,

Sirach 35:8
Give the Lord his honour with a good eye, and diminish not the firstfruits of thine hands.

1 Maccabees 8:30
Howbeit if hereafter the one party or the other shall think to meet to add or diminish any thing, they may do it at their pleasures, and whatsoever they shall add or take away shall be ratified.