The first occurrence.
And He shall say: Where are their gods, their rock in whom they trusted? Deu 32:37
The primitive root.
Strong’s H2620 חסה chasah; a primitive root meaning, “to seek or find refuge.” The 3-letter root is chet + sin + hey.
chet ח = the wall, thus outside, divide, half
sin ס = the thorn, thus grab, hate, protect
hey ה = man w/ raised arms, thus look, reveal, wonder, worship, breath
The story: When the wall (chet) which protects (sin) is found (hey, in the sense of pointing out a discovery). Our English word “house” comes from the CH-S root.