The first occurrence.
And there was evening and there was morning, a fifth day. Gen 1:23
The primitive root.
chet ח = wall, thus outside, divide, half
mem מ ם = water, thus chaos, mighty, blood
shin ש = two front teeth, thus sharp, press, eat, two, again
The cognate words will help us find the story. They are ‘fingers,’ ‘to grab,’ ‘to touch,’ ‘to hold:’ Fingers are divided (chet) from the might (mem) of the hand multiple times (shin); the fingers of the hand number five.