The first occurrence.
And the woman conceived, and bore a son: and when she saw that he was a goodly child, she hid him three months. Exo 2:2
The primitive root.
Strong’s H6845 צפן tsaphan, a primitive root meaning, “to conceal;” also “to lay up, to store up.” The 3-letter root is tsadey + pey + nun.
tsadey צ, ץ = the trail, thus a man concealed, journey, chase, hunt
pey פ, ף = the mouth, thus open, blow, scatter, edge
nun נ, ן = the seed, thus continue, heir, son
The story: A concealed (tsadey) mouth (pey) causes to continue (nun), that is, a treasure which is hidden remains so when the mouth never speaks of it.