Psalm 104:9 in the World English Bible
You have set a boundary that they may not pass over, that they don’t turn again to cover the earth.
Context
8 They go up by the mountains; they go down by the valleys unto the place which thou hast founded for them.
9 Thou hast set a bound that they may not pass over; that they turn not again to cover the earth.
10 He sendeth the springs into the valleys, which run among the hills.