The following oath shall be administered to the foreman of the grand jury: “You, as foreman of the grand jury of _____ county, do solemnly swear (or affirm as the case may be) that you will diligently inquire and true presentment make of all indictable offenses given you in charge, as well as those brought to your knowledge, committed or triable within the county; the state‘s counsel, your fellows’ and your own you shall keep secret; you shall present no person from envy, hatred or malice, nor leave any one unpresented from fear, affection, reward or the hope thereof; but you shall present all things truly as they come to your knowledge, to the best of your understanding. So help you God.”