1 Samuel 13:21
They charged two-thirds of a shekel to sharpen plowshares and cutting instruments, and a third of a shekel to sharpen picks and axes, and to set ox goads.
Treasury of Scripture Knowledge
Summary
                            Yet they had a file for the mattocks, and for the coulters, and for the forks, and for the axes, and to sharpen the goads.                        
                    Sharpen
General references
Bible References
Sharpen
                                        1 Samuel 13:21                                        
                                                            
                        They charged two-thirds of a shekel to sharpen plowshares and cutting instruments, and a third of a shekel to sharpen picks and axes, and to set ox goads.
                                    General references
                                        Deuteronomy 28:43                                        
                                                            
                        The foreigners who reside among you will become higher and higher over you and you will become lower and lower.