It shall not only be a plain, but a safe way, free from all annoyance or danger from mischievous creatures. This is the same promise, for substance, with that Isaiah 11:9, They shall not hurt nor destroy in all my holy mountain.
Related Commentaries of Isaiah 35:9
Isaiah 35:9
9 No lion shall be there, nor any ravenous beast shall go up thereon, it shall not be found there; but the redeemed shall walk there: