Rashi on Exodus 14:28/רש"י על שמות י״ד:כ״ח

1ויכסו את הרכב ... לכל חיל פרעה AND COVERED THE CHARIOTS … AND ALL THE FORCES OF PHARAOH — in regard to the ל of לכל, this is the way of Scripture verses (of Biblical Hebrew) to write a redundant ל, as in (Exodus 27:3) “all (לכל) its vessels shalt thou make of copper”.. So, too, (Exodus 27:19) ‘‘all (לכל) the vessels of the dwelling in all the service thereof”; (Numbers 4:32) “and their pins and their cords and all (לכל) their vessels”. It is only an elegancy of style.