Verses with the word knife in the Old Testament (6 verses):

Genesis 22:6
And Abraham took the wood of the burnt offering, and laid it upon Isaac his son; and he took the fire in his hand, and a knife; and they went both of them together.

Genesis 22:10
And Abraham stretched forth his hand, and took the knife to slay his son.

Judges 19:29
And when he was come into his house, he took a knife, and laid hold on his concubine, and divided her, together with her bones, into twelve pieces, and sent her into all the coasts of Israel.

Proverbs 23:2
And put a knife to thy throat, if thou be a man given to appetite.

Ezekiel 5:1
And thou, son of man, take thee a sharp knife, take thee a barber's razor, and cause it to pass upon thine head and upon thy beard: then take thee balances to weigh, and divide the hair.

Ezekiel 5:2
Thou shalt burn with fire a third part in the midst of the city, when the days of the siege are fulfilled: and thou shalt take a third part, and smite about it with a knife: and a third part thou shalt scatter in the wind; and I will draw out a sword after them.