Saul took

1 Samuel 13:2
He chose for himself three thousand men of Israel: Two thousand were with Saul at Michmash and in the hill country of Bethel, and a thousand were with Jonathan in Gibeah of Benjamin. And the rest of the troops he sent away, each to his own home.

and went

Psalm 37:32
Though the wicked lie in wait for the righteous, and seek to slay them,

Psalm 38:12
Those who seek my life lay snares; those who wish me harm speak destruction, and plot deceit all day long.

the rocks

Psalm 104:18
The high mountains are for the wild goats, the cliffs a refuge for the coneys.

Psalm 141:6
When their rulers are thrown from the cliffs, the people will listen to my words, for they are pleasant.