Heb. sakkin, a knife for any purpose, a table knife (Proverbs 23:2).
Heb. mahalaph, a butcher's knife for slaughtering the victims offered in sacrifice (Ezra 1:9).
Smaller knives (Heb. ta'ar, Jeremiah 36:26) were used for sharpening pens. The pruning-knives mentioned in Isaiah 18:5 (Heb. mizmaroth) were probably curved knives.
