The first occurrence.
And he believed in the LORD; and he counted it to him for righteousness. Gen 15:6
(In the Scripture Picture: And as for you, you meant evil against me, but God meant it for good … Gen 50:20)
The primitive root.
Strong’s H2803 חשב chashab, a primitive root meaning, “to think, meditate, to purpose, to plot.” The 3-letter root is chet + shin + bet.
chet ח = the wall, thus outside, divide, half
shin ש = two front teeth, thus sharp, press, eat, two, again
bet ב = the house, thus house, household, family, in, within
The story: When a problem or concept is weighed, considered, analyzed, reckoned, worked out, it is first divided (chet) into its components, and then chewed on (shin) within (bet) the heart and mind.